CN1146271C - Transmission power control device for portable terminal - Google Patents
Transmission power control device for portable terminal Download PDFInfo
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- CN1146271C CN1146271C CNB95118606XA CN95118606A CN1146271C CN 1146271 C CN1146271 C CN 1146271C CN B95118606X A CNB95118606X A CN B95118606XA CN 95118606 A CN95118606 A CN 95118606A CN 1146271 C CN1146271 C CN 1146271C
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Abstract
The present invention relates to a device for controlling the signal output of a transmitter, which comprises a power amplifying circuit, a coupler, a variable gain amplifier, a detection circuit, a differential amplifier and a control circuit, wherein the power amplifying circuit amplifies input transmission signals; the coupler monitors the transmission signals amplified by the power amplifying circuit; the variable gain amplifier amplifies the monitored signals; the detection circuit detects the output signals of the variable gain amplifier and generates detection voltage; the differential amplifier makes comparison between the detection voltage and the provided reference voltage, and amplifies the difference to generate first control voltage; the control circuit generates second control voltage and the reference voltage.
Description
Technical field
The present invention relates to a kind of emission power control device of controlling the emission output of carried terminal.
Background technology
In the prior art, be used for communication equipment particularly the power control circuit of the output control of mobile communication equipment such as portable phone be located at for example least significant end of emitter, and making transmitted power level be classified to change controls, perhaps automatically export predetermined transmitted power level, be used for stably keeping its output.
Fig. 1 is the structure chart of employed existing transmission power control circuit in analog form portable phone system.
As the power amplification circuit 201 of the amplifying device that transmits by the control voltage V that is added on its voltage controling end
CONTChange amplification coefficient.
Amplified with predetermined amplification coefficient by power amplifier circuit 201 from transmitting of being sent of the output circuit (not shown) of communication equipment, the coupler 202 of the degree of coupling of its output by having the 10-20dB degree is monitored at ordinary times.
Monitoring output is carried out the envelope detection by testing circuit 203, and is transformed to the direct current detecting circuit.
Detect voltage Vd and be added on the reverse input end 204a of differential amplifier circuit 204, and on the opposing party's non-inverting input, apply the reference voltage V that is generated by control circuit 205
Ref
This control voltage V
CONTFeedback is input on the voltage controling end of power amplification circuit 201, with the amplification coefficient of increase and decrease power amplification circuit 201.
Like this, the reference voltage V that takes place by control circuit 205 by control
Ref., just can obtain should reference voltage V
RefMagnitude of voltage, and, once fixed reference voltage V
Ref., make emission output always for constant with regard to having realized the level equalizationization that produces by feedback loop.
But in having the transmission power control circuit of above-mentioned this structure, the control range of power control just becomes the reference voltage V by the dynamic range of detecting circuit 203 and generation in control circuit 205
Ref, scope determine, under the situation that the dynamic range of power control broadens, the problem that can not fully handle will take place then.
Promptly, first, though detecting circuit 203 is generally constituted by the diode 203a that is used for the rectification AC signal with by the straight line wave detector 203b that resistance and capacitor constituted and monitor coupler output signal envelope line, but in this detecting circuit 203,, the general characteristic of diode 203a just has the problem of the insensitive interval that can not fully move because working as when the forward voltage of being imported drops to about 0.1V degree.Thus, the dynamic range of detecting circuit 203 only can obtain high 30-40dB degree, and has restricted its detectable scope, and its result has restricted the power control range.
The second, become possibility even suppose the detection of covering wide dynamic range in detecting circuit 203, then in this battery-driven communication equipment of portable telephone terminal,, limited reference voltage V owing to come work with the low-voltages such as 6V of miniaturization and
RefAnd control voltage V
RefVoltage range, thus, the control range of power control is restricted.
Particularly, carry in the Circuits System (IS-95 specification) at U.S. CDMA (Code Division Multiple Access) mode digital cellular, in the wide dynamic range more than the 64dB at least, require power control with the 1dB stride, in the structure of existing transmission power control circuit shown in Figure 1, because in the insensitive interval of detecting circuit as described above with use restriction on the voltage range of battery, the dynamic range deficiency can not satisfy the standard of this mode.
And, in Fig. 1 sort circuit structure, under situation about transmitting with following this short pulse mode: employed TDMA in Japan-US digital cellular telephone (TimeDivision Multiple Access) mode (RCR-STD27C, IS-54 specification) also can produce other problem.
Promptly, in the emission of short pulse mode, because the monitoring that is produced by coupler 202 output is connected and short pulse very big change takes place when turn-offing at short pulse, very cataclysm also appears in detecting circuit Vd thereupon thus, thereby just has and can not correctly carry out the problem that power is controlled.
Summary of the invention
In view of above-mentioned prior art problems, the purpose of this invention is to provide a kind of transmission power control circuit that is used for carried terminal, can cover big dynamic range and carry out correct power control.
Because the transmission power control circuit that is used for carried terminal that the present invention relates to is characterized in that comprising: the amplifying device of being imported that transmits that transmits and amplify with amplification coefficient by added first control signal decision; To by the above-mentioned monitoring device that transmits and monitor that amplifying device amplified that transmits; The monitor signal amplifying device that above-mentioned monitor signal is amplified with the amplification coefficient by the decision of added second control signal; The output signal of above-mentioned monitor signal amplifying device is carried out detection and generated the detector arrangement of rectified signal; Above-mentioned rectified signal compared with the reference signal that provided and this difference is amplified and generated the differential amplifying device of above-mentioned first control signal; The control device of above-mentioned second control voltage and said reference voltage takes place; Wherein, for the radio of the described carried terminal that makes is output as required level, described control device generates described second control signal and goes into the unconventional and unrestrained coefficient of bigger device so that described monitor signal to be set, and changes the level of described reference signal by the function of the set amplification coefficient of described detection signal amplifying device.
And, its feature also is further to comprise sampling/holding device, under the situation of launching that transmits in the short pulse mode, be located between above-mentioned detector arrangement and the above-mentioned differential amplifying device, above-mentioned detecting circuit is taken a sample or keep according to the indication of above-mentioned control device, and this detecting circuit of taking a sample or the detecting circuit that kept are offered above-mentioned differential amplifying device.
Fig. 1 is the existing structure chart that is used for an example of transmission power control circuit of carried terminal of expression;
Fig. 2 is the structure chart of the carried terminal of the transmission power control circuit that is applicable to that first embodiment of the invention is related;
Fig. 3 is the structure chart of an example of short pulse signal generation circuit in the emission part of the above-mentioned carried terminal of expression;
Fig. 4 is the input-output characteristic figure that is used to illustrate the power control characteristic of the foregoing description;
Fig. 5 is the time signal oscillogram that is used to illustrate the power control characteristic of the foregoing description;
Fig. 6 is the structure chart of second embodiment of the invention;
Fig. 7 is the structure chart of third embodiment of the invention;
Fig. 8 is the structure chart of fourth embodiment of the invention;
Fig. 9 is the structure chart of fifth embodiment of the invention.
Embodiment
According to several embodiment the present invention is described below.
First embodiment
Fig. 2 is to use the overall structure figure of the wireless communication machine 10 of the transmission power control circuit 100 that first embodiment of the invention relates to.
As shown in the drawing, wireless communication machine 10 is made of following part: generate the emission part 120 that RF transmits; The transmitting power control circuit 100 that the output that the RF that generates in this emission part 120 is transmitted is controlled; Reception is from the acceptance division 130 of the signal of base station; Monitor the incoming level monitoring portion 131 of the incoming level in this acceptance division 130; Antenna 140.
Transmission power control circuit 100 further comprises: power amplification circuit 101, coupler 102, detecting circuit 103, differential amplifier circuit 104, control circuit 105, variable gain amplifier 106, sampling/holding circuit 107.
The power amplification that power amplification circuit 101 can carry out being generated in emission part 120 RF transmits, and by control circuit V
CONTChange its amplification coefficient.
Its internal circuit constitutes like this: controlling voltage V by applying
CONTThe variable attenuator etc. that changes the amplifier element (for example, CaAs FET and MOSFET etc.) of amplification coefficient and can change attenuation is connected in series, for example, if control voltage V
CONTBe 3.5V, then the amplification coefficient that transmits of RF increases to gain 30dB, on the other hand, if control voltage V
CONTBe 0.5V, then the amplification coefficient that transmits corresponding to RF is reduced to attenuation-60dB.
103 pairs of monitoring outputs from coupler 102 of detecting circuit are carried out detection and are generated detecting circuit Vd.
Sampling/holding circuit 107 is taken a sample to above-mentioned detecting circuit Vd according to the emission situation that transmits or is kept and export to the differential amplifier circuit 104 of next stage, and this circuit 107 is made up of internal switch 107a, capacitor 107b, differential amplifier circuit 107c, 107d.
Concrete is, internal switch 107a is between the non-inverting input of the output of differential amplifier circuit 107c and differential amplifier circuit 107d, the output of differential amplifier circuit 107d is connected with the reverse input end of differential amplifier circuit 107c, 107d respectively, simultaneously, the non-inverting input of differential amplifier circuit 107d is by capacitor 107d ground connection.
Under the situation of launching in the short pulse mode, the control signal Vb relevant with the break-make of this short pulse signal is provided for control circuit 105 by emission part 120, when receiving the signal of short pulse connection, control signal VS/H is become the H level, when receiving the short pulse cut-off signals, control signal VS/H is set at the L level.
This control signal Vb can be obtained by the short pulse signal generation circuit that for example is located in the emission part 120.
Fig. 3 is the structure chart of an example of this short pulse signal generation circuit of expression.As shown in the drawing, short pulse signal generation circuit 111 constitutes like this: be input among the AND circuit 111c the frequency input that comes self-oscillating circuit 111a with from the pulse of the 111b of pulse generation portion, having only just becomes transmit (short pulse connection) when pulse is output as the H level.
Like this, control circuit 105 is preferably this structure: former state input control circuit 105 is exported as control signal Vb in the arteries and veins station of the 111b of this pulse generation portion, control signal VS/H becomes the H level when this control signal Vb is the H level, when control signal Vb was the L level, control signal VS/H signal became the L level.
Control the action of sampling/holding circuit 107 by the control signal VS/H of such generation, when control signal VS/H was the H level, its internal switch 107a became connection.
At this moment, because the output of differential amplifier circuit 107d is connected with the reverse input end of differential amplifier circuit 107c, 107d respectively, then the current potential of each input and output becomes equal, last detecting circuit Vd in statu quo by becoming sampling voltage (sampling state).
Otherwise when control signal VS/H was the L level, internal switch 107a became shutoff, and the non-return input of the differential amplifier circuit 107d only current potential with capacitor 107b is relevant.On this capacitor 107b, because the internal resistance height of differential amplifier circuit 107d, the current potential of the last detecting circuit Vd of then above-mentioned sampling state is maintained on the original state, and, because the output of differential amplifier circuit 107d links to each other with its reverse input end, then the current potential of each input and output equates, the detecting circuit Vd during sampling is held, and is output (hold mode) as sustaining voltage VDC.
Resulting sampling/sustaining voltage VDC is added on the reverse input end of differential amplifier circuit 104 in sampling/holding circuit 107, and the reference voltage V that is generated by control circuit 105
Ref, be transfused to non-inverting input.
Differential amplifier circuit generates according to sampling/sustaining voltage V
DCAnd reference voltage V
Ref, difference and the control voltage V that forms
CONTAnd it is offered power amplification circuit 101.
Specify the control action of present embodiment below.
The reception monitoring voltage Vr that input is monitored by the incoming level monitoring portion 131 that links to each other with acceptance division 103 in control circuit 105 decides the emission output that is produced by power amplification circuit 101 according to this reception monitoring voltage Vr.
Promptly, at the level that receives monitoring voltage Vr hour, be judged as from base station far away thus, then increase emission output, otherwise, when this level is big, just be judged as nearer from base station, by emission output is diminished, and decision is exported in emission be: it is constant making the launching electrical level that arrives base station.
This method that reception output level in the acceptance division 130 is monitored and determine to launch output level is by United States Patent (USP) the 5th, 056, and No. 109 communique is disclosed, thereby omits its explanation.
Then, control circuit 105 is expectant control voltage V
GCOffer variable gain amplifier 106 to set gain coefficient corresponding to the emission output that is determined, simultaneously, the relevant and reference voltage V that determines with the gain of above-mentioned variable gain amplifier 106
Ref, offer the non-inverting input of this differential amplifier circuit 104.
Fig. 4 is that expression is used for illustrating that transmission power control circuit 100 changes the input-output characteristic figure of the input power of the characteristic under the gain coefficient situation of variable gain amplifiers 106 to the power output relation.
As shown in the drawing, as the emission output P of necessity
oIn the time of between 0dBm to 28dBm, because the monitoring output level of coupler 102 is the level that can make the detector diode conducting in statu quo of detecting circuit 103, then control voltage V
GCBe set at 1V so that the gain of variable gain amplifier 106 is 0dB, simultaneously, make reference voltage V
Ref, between from 0.1V to 3.5V, for example, emission if necessary is output as 20dBm, then is set at 2.1V.
Equally, as emission output P
oWhen-30dBm-0dBm, control voltage V
GCBe set at 1.5V so that the gain of variable gain amplifier 106 is 30dB, between 0.1V to 3.6V, set reference voltage V simultaneously
RefTo become required emission output.
And, when emission be output as-60dBm～-during 20dBm, make control voltage V
GCSo that the gain of variable gain amplifier 106 becomes 60dB, simultaneously, between 0.1V to 2.1V, set reference voltage V for 2V
Ref, to become required emission output.According to this structure, by being located at the effect of the variable gain amplifier 106 between coupler 102 outputs and the detecting circuit 103, when and monitoring output level coupler 102 big when the emission output level is big, just can reduce the gain of variable gain amplifier, otherwise, less and monitoring output level hour when the emission output level, can improve the gain of variable gain amplifier, thereby no matter the size of monitoring output level can both be controlled to be the incoming level of the scope (detectable scope) of the detector diode conducting always in the detecting circuit.
The detecting circuit Vd that is generated by detecting circuit 103 becomes sampling/sustaining voltage V by sampling/holding circuit 107
DC, offer the reverse input end of differential amplifier circuit 104.
On the non-inverting input of differential amplifier circuit 104, apply the above-mentioned this reference voltage V that should obtain predetermined emission output and be taken place by control circuit 105
Ref
Like this, by a control voltage V
CONTFeed back to power amplification circuit 101, control, emission output setting is maintained by reference voltage V corresponding to the amplification coefficient that transmits in the power amplification circuit 101
Ref, on the desirable value that is determined.Thereby, transmit and from antenna 140, stably launch as radio wave with predetermined output.
Owing to change the gain of variable gain amplifier 106 according to the emission output level, and the incoming level of detecting circuit 103 is controlled on the state of detection two utmost point utmost point 03a conductings always of detecting circuit 103, thereby variable control is launched under the situation of output level in wide scope, the detectable scope level that always keeps detecting circuit 103, and then the reference voltage V that generates for power control usefulness
RefAnd differential amplifier circuit output voltage V
CONTJust can be can saturated scope not control.
Can make emission output cover the dynamic range of non-constant width like this, output level is changed with multistage and high precision high stability ground.
If the input-output characteristic figure with Fig. 4 is an example, when input power is 0dBm, by making reference voltage V
RefSuch as among the figure change the record and simultaneously the gain of variable gain amplifier become three sections (0dB, 30dB, 60dB), just can make power output-60dBm～+ change between the 28dBm and obtain the power control dynamic range of 88dB, just can substantially exceed dynamic range by the desired 64dB of digital cellular portable phone system (IS-95 specification) of U.S. CDMA mode.
Be contained in the preset range reference voltage V corresponding to the detecting circuit Vd that is generated by detecting circuit 103
RefJust can be contained in (in the example of Fig. 4, from 0.1V to 3.6V) in the preset range, under only can be, can access big power control dynamic range, be convenient to as the transmission power control circuit that carries communication equipment etc. with the battery-operated situation that obtains low-voltage.
And, in this embodiment, though the gain of in 0dB, 30dB, 60dB three sections, switching variable gain amplifier, as the dynamic range of total 88dB, but be not limited to this, can dynamic range as required change the gain number of handovers of variable gain amplifier.
The following describes the action of the sampling/holding circuit 107 in the transmission power control circuit 100.
Fig. 5 is the each several part time signal waveform of the transmitting power control characteristic of expression when launching short pulse signal in the TDMA mode (under input power Pi=0dBm is constant situation).
Under the above-mentioned this short pulse situation that transmits to the TDMA mode, the control signal Vb of the portion of spontaneous emission always 130 judges, when short pulse is connected, sampling/retentive control signal the VS/H of input sampling/holding circuit 107 is set at H level (sampling state), when short pulse turn-offs, sampling/retentive control signal VS/H is set at L level (hold mode).
Like this, because the on/off repeated sampling synchronously and automatically that sampling/holding circuit 107 and short pulse transmit/maintenance action, thereby no matter detecting circuit Vd is the sort of short pulse waveform, sampling/sustaining voltage V
DCThe short pulse that can be maintained turn-offs the level of detecting circuit Vd before and impregnable ideal power control characteristic in the short pulse on/off.
Transmitting power output P
o+ 10dBm ,+28dBm ,+switch in three sections of 15dBm, thus, reference voltage also is controlled to be three sections of V1, V2, V3, the result of FEEDBACK CONTROL, sampling/sustaining voltage V
DCConcentrate and be V1, V2, V3.
In the present embodiment, when transmitting, the sampling/retentive control signal from control circuit 105 input sampling/holding circuits 107 is fixed on (sampling state) on the H level to continuous signal.
Under the situation of Fig. 5, owing to export to control emission between the 28dm at 10dBm, though the gain of variable gain amplifier 106 is fixed on the 0dB, under the emission output situation on it or under it, gain that can appropriate change variable gain amplifier 106.
According to present embodiment, can cover the dynamic range of non-constant width, multistage ground and high precision high stability ground change output level, and, because under the situation of this continuous signal of simulation portable phone, sampling/holding circuit 107 can be fixed under the sampling state, just can carry out two kinds of power controls of continuous signal short pulse signal.
Second embodiment
Fig. 6 is the structure chart of second embodiment of transmitting power control voltage of the present invention.
For the later embodiment of second embodiment, only represent transmission power control circuit, the emission part 120 among Fig. 2, acceptance division 130, incoming level monitoring portion 131 and antenna 140 and their input-output line etc. have all omitted.
Owing to use the label identical to represent identical structural element, then omit its explanation with Fig. 2.
In an embodiment, different with first embodiment that is provided with sampling/holding circuit 107, be not transmit can corresponding short pulse signal and continuous signal in any is such, but be controlled to be object with the power of only launching under the continuous signal situation.
Like this, the structure of present embodiment is compared with first embodiment only following difference: saved the sampling/holding circuit 107 between detecting circuit output 103 and the differential amplifier circuit 104, and in control circuit 105 not with from the relevant input of the short pulse signal of emission part, control signal VS/H does not take place.
If think that the control voltage VS/H that imports the sampling/holding circuit 107 among Fig. 2 is the sampling state always, then the operating principle of present embodiment and structure are identical with first embodiment except sampling/holding circuit 107, thereby omit its explanation.
The 3rd embodiment
Fig. 7 is the structure chart of transmission power control circuit the 3rd embodiment of the present invention.
With the difference of first embodiment be: not that variable gain amplifier is intactly imported in the monitoring output from coupler 102, but input again after carrying out frequency translation.
That is, the monitoring output of coupler 102 is once input mixer 108 just carries out multiplying in this output with oscillating circuit 109, and the monitor signal output frequency is transformed to for example following low frequency range (frequency reducing frequency conversion) of 10MHz.
Then, only take out the envelope signal that desired signal has promptly been removed the low frequency range of high frequency composition by the filter 110 (band pass filter or low pass filter) of next stage, and be input to the variable gain amplifier 1061 of low frequency range.
The frequency-conversion circuit of being formed by this frequency mixer 108, oscillating circuit 109, filter 110 is converted to low frequency range (frequency reducing frequency conversion) to the monitoring output that coupler produced, and thus, circuit scale than first embodiment and second embodiment more greatly.
But, variable gain amplifier 106 in the RF of first embodiment emission band mostly is expensive element, and in the present embodiment, only carry out the frequency reducing frequency conversion by this simple frequency changer circuit of Fig. 7 is set, the advantage of the OP amplifier that can utilize lower price etc. is just arranged.
Except frequency changer circuit was set, structure, control action were identical with first embodiment, thereby had omitted their explanation.
The 4th embodiment
Fig. 8 is the structure chart of transmission power control circuit the 4th embodiment of the present invention.
In first to the 3rd embodiment, be to carry out power control at power amplification circuit 101 with full RF emission band, and in the present embodiment, have this feature: the IF frequency band amplifying circuit 111 that the amplifying circuit that is used for power control is divided into RF band power amplifying circuit 101 and its prime.
Promptly, the feedback loop end of differential amplifier circuit 104 links to each other with IF frequency band amplifying circuit 111, the output signal of this amplifying circuit 111 and come the output of self-oscillating circuit 112 to carry out mixing and be converted to RF frequency band (raising frequency frequency conversion), select required RF band signal by the filter 114 of subordinate by frequency mixer 113 then.
After this, be input to the control circuit V that has applied from control circuit 105
CNTRF band power amplifying circuit 101 in.
Like this, the output voltage V e of differential amplifier circuit 104 is added on the IF frequency band amplifying circuit 111, the control voltage V of control circuit 105
CONTBe added on the RF band power amplifying circuit 101.
Thus, launch the stabilizing output level adjustment, and finish the increase and decrease control of emission output by power amplification circuit 101 by amplifying circuit 111.
Just can finish the inspection accurate power controls by sharing task with this two-stage amplifying circuit.
Otherwise, also can use this structure: the output voltage V e of differential amplifier circuit 104 is offered power amplification circuit 101 and a control voltage V from control circuit 105
CONT Offer amplifying circuit 111, the stabilisation adjustment of launching output level by power amplification circuit 101, and launch the increase and decrease control of output by amplifying circuit 111.
Use the sort circuit structure, except realizing above-mentioned split-hair power control, also have the advantage of cost aspect.
That is, use the amplifier element of identical progression and its as common RF band amplifier not as the IF band amplifier, can obtain to gain, can make gain control range wideer thus, and, because the IF band amplifier generally is used under the situation of low price, just can suppress manufacturing cost.
The 5th embodiment
Fig. 9 is the structure chart of the fifth embodiment of the present invention.
In this embodiment, express the circuit structure that can be applicable to U.S.'s analog form and digital form common type (hereinafter referred to as dual mode) peak cellular telephone system.
Now, become standardization and the dual mode cell phone system that can realize is following two kinds in the U.S.:
(1) common type of simulation FDMA mode and digital TDMA mode
(2) common type of simulation FDMA mode and digital CDMA mode.
Wherein, simulation FDMA (Frequency Division Multiple Access) mode is called as simulation AMPS (Advanced Mobile Phone System) mode, and power control must be the 20dB scope (mobile machine class III) with the 4dB stride.
Must be 20dB power control range (mobile machine class III) equally in the digital TDMA mode with the 4dB stride.
On the other hand, in the digital CDMA mode, must be the power control range more than the 64dB at least (mobile machine class III) with the 1dB stride.
In Fig. 9, power amplification circuit 117 constitutes like this: being connected in series on the back level of the variable attenuator 118 that is changed attenuation by institute's making alive is changed the power amplifier 119 of amplification coefficient by identical institute making alive.
The output of differential amplifier circuit 104 is connected on the A end of the B end of switch 115 and switch 116 along separate routes, the terminal that control circuit 105 sends control voltage Vf respectively the shunt A that is connected to switch 115 hold and the B end of switch 116 on.
The switching of switch 115 is output as the control voltage output of the attenuation of variable attenuator 118 in the power controlling amplifying circuit 117, and the switching of switch 116 is output as the control voltage input of the amplification coefficient of these power amplification circuit 117 internal power amplifiers 119 of control.
Like this, the control of the feedback loop of this transmission power control circuit is terminal selects to switch to control with variable attenuator 118 and power amplifier 119 by switch 115 and switch 116.
Wherein, with manually import the mode of using in control circuit 105, the switch-over control signal Vg of switches 115 and switch 116 takes place by this control circuit 105 by for example.
In above-mentioned this structure, present embodiment at first describes the action under the dual mode institute usable condition of (1)
In the dual mode of (1), under analog form and digital form, though the power control range is identical with stride, in analog form, use the FM modulation system, in digital form, use the modulation system of π/4 displacement QPSK, particularly, in digital form, owing to be that distorted characteristic is then paid attention in linear modulation, and in analog form, distorted characteristic less is a problem, and mainly is conceived to efficient.
At this, in the radiation pattern (hereinafter referred to as analog form) of analog form, according to the switching signal Vg from control circuit 105, switch 115 and switch 116 switch to the A side.
At this moment, the control voltage Vf (steady state value) that is generated from control circuit 105 imports variable attenuators 118 so that the attenuation of variable attenuator 118 becomes minimum by switch 115.
The reference voltage V that is provided by control circuit 105 is provided by ladder ground
RefAnd the control voltage Ve that is supplied with change for power amplifier 119 realizes power control in the maximum 20dB scope with the 4dB stride.
On the other hand, in digital form, according to the switching signal Vg from control circuit 105, switch 115 and switch 116 are switched to the B side.
In this mode, following method is adopted in transmitting power control: adjust the attenuation of variable attenuator 118, change the input power of power amplifier 119, in the amplification that is produced by power amplifier 119, be set at the incoming level of distorted signals characteristic minimum.
Thus, in control circuit 105, determine reference voltage V
RefSo that can make incoming level to power amplifier 119, and obtain required emission output in the little scope of above-mentioned distorted signals characteristic.According to this reference voltage V
Ref,, offer variable attenuator 118 by switch 115 from differential amplifier circuit 104 output control voltage Ve.
On the other hand, in control circuit 105, generate control voltage Vf, with as the bias voltage corresponding to power amplifier 119, its working point is A level or the AB level work that the excellence of less linearity takes place in distortion, and this control voltage Vf offers this power amplifier 116 by switch 116.
Thus, in digital form, realized the adjustment of the emission output that distortion is little.
And in analog form, owing to be to transmit continuously, sampling/holding circuit 107 is a sampling action always, and detecting circuit 103 outputs are intactly offered the reverse input end of differential amplifier circuit 104.
On the other hand, in digital form, according to the short pulse on/off that TDMA transmits, sampling/holding circuit 107 is carried out above-mentioned sampling/maintenance action automatically.
Under the dual mode of (1), as described above, owing to only need the dynamic range of 0dB to 20dB, under the situation of any mode, the gain of variable gain amplifier 106 is fixed as on the steady state value (for example 0dB) in simulation, numeral.
Following present embodiment describes the action under the situation that dual mode was suitable for of (2).
At first, in analog form since be identical to (1) described action, then omit its explanation.
In digital form, though switch 115 is switched to the B side identical with the situation of (1) with switch 116, in the CDMA mode, owing to need the above dynamic range of 64dB at least, the control action that produces by control circuit 105 some difference slightly then.
Promptly, in control circuit 105, generate the control voltage Vf that imposes on power amplifier 119, as bias voltage corresponding to power amplifier 119, its working point is set at distortion and takes place in the less linear excellent zone, become the action of A level or AB level, this control voltage Vf is provided by switch 116.
Thereby, though transmitting power control is to be undertaken by the attenuation of adjusting variable attenuator 118,, then should change attenuation, to set reference voltage V with the scope bigger than the situation of (1) because the dynamic range of power control is big
Ref
In this case, wishing becomes in the scope of the little incoming level of distorted signals characteristic as far as possible in the amplification of power amplifier 119, change the attenuation of variable attenuator 118, but because the extension of dynamic range just there is this to require some situations about falling back.
And, in this case and since control from the control voltage of control circuit 105 so that the working point in the power amplifier 119 is linear district, just can fully compensate this inappropriate situation.
And, increase along with the dynamic range of launching output level, the gain of increase and decrease control variable gain amplifier 103, so that it is the monitoring of coupler 102 output becomes the detectable scope level of detecting circuit 103, described like that according to first embodiment for this control action.
In above-mentioned this embodiment, a kind of transmission power control circuit is provided, only be set on the appropriate value, just can be suitable for simulating the arbitrary mode in FDMA (simulation AMPS) mode, digital TDMA mode, the digital CDMA mode by the switching of switch 115,116 with control voltage and reference voltage from control circuit.
Certainly, self-evident, the present invention is not limited in the content of the various embodiments described above.
Claims (25)
1. the device of a radio output of controlling carried terminal is characterized in that comprising:
The amplifying device that transmits amplifies transmitting of being imported with the amplification coefficient by added first control signal decision;
Monitoring device is to being monitored by above-mentioned the transmitting that amplifying device amplified that transmit;
The monitor signal amplifying device amplifies above-mentioned monitor signal with the amplification coefficient by added second control signal decision;
Detector arrangement is monitored the output signal of above-mentioned monitor signal amplifying device;
Differential amplifying device compares above-mentioned detection signal and amplifies its difference and generate above-mentioned first control signal with the reference signal that provided;
Above-mentioned second control signal and said reference signal take place in control device; Wherein,
For the radio output that makes above-mentioned carried terminal becomes ideal level, above-mentioned control device produces above-mentioned second control signal so that the amplification coefficient of above-mentioned monitor signal amplifying device to be set, and the function of said reference signal as the set amplification coefficient of above-mentioned detection signal amplifying device changed.
2. according to the device of claim 1, it is characterized in that,
Above-mentioned control device determines the amplification coefficient of above-mentioned monitor signal amplifying device, so that the level of above-mentioned monitor signal is in the detectable scope of above-mentioned detector arrangement, and above-mentioned second control signal takes place.
3. according to the device of claim 2, it is characterized in that,
Above-mentioned control device passes through above-mentioned second control signal that taken place, with the magnification ratio of the above-mentioned monitor signal amplifying device of ladder ground control.
4. according to the device of claim 2, it is characterized in that comprising:
Sampling/holding device, be located between above-mentioned detector arrangement and the above-mentioned differential amplifying device, above-mentioned rectified signal is taken a sample or keep according to the indication of above-mentioned control device, and the rectified signal of the rectified signal of this sampling or maintenance is offered above-mentioned differential amplifying device.
5. according to the device of claim 4, it is characterized in that,
Above-mentioned transmitting is the signal of launching in the short pulse mode, and carries out following control by above-mentioned control device: above-mentioned sampling/holding device, when the above-mentioned short pulse that transmits is connected, above-mentioned monitor signal is taken a sample; When turn-offing, the above-mentioned short pulse that transmits keeps the above-mentioned monitor signal of this short pulse before turn-offing.
6. according to the device of claim 2, it is characterized in that also comprising:
The first frequency converting means is located between above-mentioned monitoring device and the above-mentioned monitor signal amplifying device, the monitor signal frequency conversion from above-mentioned monitoring device is become to be lower than the frequency of above-mentioned monitor signal, and offer above-mentioned monitor signal amplifying device.
7. according to the device of claim 6, it is characterized in that also comprising:
Sampling/holding device, be located between above-mentioned detector arrangement and the above-mentioned differential amplifying device, according to the indication of above-mentioned control device, above-mentioned rectified signal is taken a sample or kept, and the rectified signal of the rectified signal of this sampling or maintenance is offered above-mentioned differential amplifying device.
8. according to the device of claim 7, it is characterized in that,
Above-mentioned transmitting is the signal of launching in the short pulse mode, and carries out following control by above-mentioned control device: above-mentioned sampling/holding device, when the above-mentioned short pulse that transmits is connected, above-mentioned monitor signal is taken a sample; When turn-offing, the above-mentioned short pulse signal that transmits keeps the above-mentioned monitor signal of this short pulse before turn-offing.
9. according to the device of claim 2, it is characterized in that,
The above-mentioned amplifying device that transmits is made of first amplifying device and second amplifying device that change the series connection setting of amplification coefficient by the institute increase control signal respectively;
Above-mentioned first control signal is added on above-mentioned first amplifying device, simultaneously, is added on above-mentioned second amplifying device by the 3rd control signal that above-mentioned control device provided.
10. according to the device of claim 9, it is characterized in that,
Above-mentioned first amplifying device is the amplifying device that amplifies the IF band signal, and above-mentioned second amplifying device is the amplifying device that amplifies the RF band signal simultaneously, further comprises:
Frequency-transposition arrangement is located between above-mentioned first amplifying device and above-mentioned second amplifying device, and the IF band signal is transformed into the RF band signal.
11., it is characterized in that also comprising according to the device of claim 10:
Sampling/holding device is located between above-mentioned detector arrangement and the above-mentioned differential amplifying device, according to the indication of above-mentioned control device, above-mentioned rectified signal is taken a sample or is kept, and the signal of the signal of this sampling or maintenance is offered above-mentioned differential amplifying device.
12. the device according to claim 11 is characterized in that,
Above-mentioned transmitting is the signal of launching in the short pulse mode, and carries out following control by above-mentioned control device: above-mentioned sampling/holding device, when the above-mentioned short pulse that transmits is connected, above-mentioned monitor signal is taken a sample; When turn-offing, the above-mentioned short pulse that transmits keeps the above-mentioned monitor signal of this short pulse before turn-offing.
13. a device that is used to control the radio output of carried terminal is characterized in that comprising:
The amplifying device that transmits amplifies transmitting of being imported with the amplification coefficient by added first control signal decision;
Monitoring device is to being monitored by above-mentioned the transmitting that amplifying device amplified that transmit;
The monitor signal amplifying device amplifies above-mentioned monitor signal with the amplification coefficient by added second control signal decision;
Detector arrangement is monitored the output signal of above-mentioned monitor signal amplifying device;
Differential amplifying device compares above-mentioned detection signal and amplifies its difference and generate above-mentioned first control signal with the reference signal that provided; With
Above-mentioned second control signal and said reference signal take place in control device;
Wherein
Above-mentioned control device determines the amplification coefficient of above-mentioned monitor signal amplifying device, so that the level of the output of above-mentioned detection device is in the scope that allows above-mentioned detector arrangement detection; And
The above-mentioned amplifying device that transmits comprises:
Attenuating device changes attenuation by added control signal;
The 3rd amplifying device is located at the back level of above-mentioned attenuating device, changes amplification coefficient by added control signal;
Further comprise:
Switching device shifter, to switching and become from first control signal of above-mentioned differential amplifying device with by the 4th control signal that above-mentioned control device provided:
Above-mentioned the 4th control signal imposed on above-mentioned attenuating device and above-mentioned first control signal is imposed on first connection status of above-mentioned the 3rd amplifying device;
Above-mentioned first control signal imposed on above-mentioned attenuating device and above-mentioned the 4th control signal is imposed on second connection status of above-mentioned second amplifying device.
14. the device according to claim 13 is characterized in that,
Above-mentioned switching device shifter according to the indication from above-mentioned control device, switches to above-mentioned first connection status when transmitting to analog signal above-mentioned, switches to above-mentioned second connection status when transmitting to digital signal above-mentioned.
15. the device according to claim 14 is characterized in that,
Under above-mentioned first connection status, in above-mentioned control device, set above-mentioned the 4th control signal, so that the attenuation of above-mentioned attenuating device is minimum.
16. the device according to claim 15 is characterized in that,
Under above-mentioned second connection status, in above-mentioned control device, set above-mentioned the 4th control signal, so that the working point of above-mentioned the 3rd amplifying device is in linear district.
17., it is characterized in that also comprising according to the device of claim 16:
Sampling/holding device, be located between above-mentioned detector arrangement and the above-mentioned differential amplifying device, according to the indication of above-mentioned control device, above-mentioned rectified signal is taken a sample or kept, and the rectified signal of the rectified signal of this sampling or maintenance is offered above-mentioned differential amplifying device.
18. the device according to claim 17 is characterized in that,
Above-mentioned transmitting is the signal of launching in the short pulse mode, and carries out following control by above-mentioned control device: above-mentioned sampling/holding device, when the above-mentioned short pulse that transmits is connected, above-mentioned monitor signal is taken a sample; When turn-offing, the above-mentioned short pulse that transmits keeps the above-mentioned monitor signal of this short pulse before turn-offing.
19. a device of controlling the radio output of carried terminal is characterized in that comprising:
The emission output amplifier amplifies the signal that is launched, by the first control control signal decision amplification coefficient;
Monitoring device is located at the outlet side of above-mentioned emission output amplifier, monitors this emission power output;
Variable gain amplifier amplifies the emission output of being monitored, by second control signal decision amplification coefficient;
Detector arrangement based on diode, carries out detection to the output signal of variable gain amplifier;
Differential amplifier compares detection output with reference signal, amplify its difference, generates first control signal;
Control control, above-mentioned second control signal and reference signal take place, second control signal is adjusted into such value: the gain of decision variable gain amplifier is so that the level of monitor signal in the detectable scope of detector arrangement, is adjusted reference signal by the function of above-mentioned second control signal.
20. the device according to claim 19 is characterized in that,
The said reference signal and second control signal are adjusted to have following correlation: when radio output increased, the gain of variable gain amplifier reduced.
21. a device of controlling the radio output of carried terminal is characterized in that comprising:
The amplifying device that transmits amplifies transmitting of being imported with the amplification coefficient by added first control signal decision;
Monitoring device is to being monitored by above-mentioned the transmitting that amplifying device amplified that transmit;
The monitor signal amplifying device amplifies above-mentioned monitor signal with the amplification coefficient by added second control signal decision;
Detector arrangement is monitored the output signal of above-mentioned monitor signal amplifying device;
Differential amplifying device compares above-mentioned detection signal and amplifies its difference and generate above-mentioned first control signal with the reference signal that provided;
Above-mentioned second control signal and said reference signal take place in control device;
Wherein,
Above-mentioned control device determines the amplification coefficient of above-mentioned monitor signal amplifying device, so that the level of the output of above-mentioned detection device is in the scope that allows above-mentioned detector arrangement detection;
The above-mentioned amplifying device that transmits is made of first amplifying device and second amplifying device, setting of above-mentioned first and second amplifying devices polyphone and the control signal that makes its corresponding magnification ratio pass through to be applied change, above-mentioned first control signal is applied to above-mentioned first amplifying device, and the 3rd control signal that above-mentioned control device comes is applied to above-mentioned second amplifying device; And
Above-mentioned first amplifying device is the amplifying device that is used to amplify IF frequency range signal, and above-mentioned second amplifying device is the amplifying device that is used to amplify RF frequency range signal, the device that is used to control radio output also comprises frequency-transposition arrangement, it places between above-mentioned first amplifying device and above-mentioned second amplifying device, is used for IF frequency range conversion of signals is become RF frequency range signal.
22. the device according to claim 1 is characterized in that,
Above-mentioned control device is controlled said reference signal and above-mentioned second control signal by the function of the incoming level of being monitored.
23. the device according to claim 22 is characterized in that, also comprises the incoming level monitoring device, it exports the reception monitoring voltage by the function of the monitored incoming level of the signal of receiving element reception.
24. the device according to claim 9 is characterized in that, above-mentioned control device changes above-mentioned the 3rd control signal, makes according to receiving monitoring voltage the emission output level to be set.
25. the device according to claim 21 is characterized in that, above-mentioned control device changes above-mentioned the 3rd control signal, makes according to receiving monitoring voltage the emission output level to be set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB95118606XA CN1146271C (en) | 1995-09-20 | 1995-09-20 | Transmission power control device for portable terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB95118606XA CN1146271C (en) | 1995-09-20 | 1995-09-20 | Transmission power control device for portable terminal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1146131A CN1146131A (en) | 1997-03-26 |
| CN1146271C true CN1146271C (en) | 2004-04-14 |
Family
ID=5081763
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB95118606XA Expired - Fee Related CN1146271C (en) | 1995-09-20 | 1995-09-20 | Transmission power control device for portable terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1146271C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040033917A (en) | 2002-10-16 | 2004-04-28 | 엘지전자 주식회사 | A device and a operating method of controlling output power for mobile phone |
| CN112148052B (en) * | 2020-09-28 | 2022-10-11 | 刘承鑫 | Portable adjustable stable alternating-current high-voltage generation system |
-
1995
- 1995-09-20 CN CNB95118606XA patent/CN1146271C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1146131A (en) | 1997-03-26 |
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