JPH05508526A - Oscillator filtration and amplification equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Oscillator filtration and amplification equipment field of invention TECHNICAL FIELD The present invention relates generally to oscillators, and more particularly to electrical oscillators used in radiotelephones. Concerned with reducing noise in the supply voltage to a voltage controlled oscillator (VCO) be.

Background of the invention Current trends in radiotelephones are toward smaller and more portable radiotelephones. I'm being kicked. Mobile phones require the use of batteries for power. No batteries Because it limits the values of current and voltage available to the line phone, it The use of current and voltage has become a very important part of wireless telephone design.

Time division multiple access (TDMA) wireless telephone systems are portable, mobile wireless telephone systems. A fixed area transceiver serving the service area where line telephone 208 is prevalent. Contains 209. Each radio used by fixed area transceiver 209 A line frequency (RF) channel divides the (RF) channel in time into different By assigning each radiotelephone 208 a time slot of It is capable of handling a large number of calls to/from machine 208. This tie is not available By assigning a large number of It is capable of handling phone calls. With this time slot, the transmission The transmitter 206 is pulsed at known intervals required for the transmitter to send data. By turning on and off, designers reduce the power consumption of wireless phones be able to. This pulse method works well if you leave the transmitter on 100% of the time. The power consumption of the transmitter 206 can be significantly reduced compared to . However, turning the transmitter on and off by pulsing it A large current train pulse occurs on the power supply 207 of the radiotelephone 208 This causes large voltage fluctuations in the power supplied to the parts.

The use of VCO 203 in wireless telephone 208 is well known. supply voltage The change may change the frequency of VCO 203, which is desirable for the output of the VCO. VCO2 contained within radiotelephone 208 because it results in no modulation sidebands. 03 is very sensitive to variations in power supply voltage. Due to voltage fluctuations in the power supply 207 To free the vCO from problems caused by low-pass filters and/or Several known techniques have been used, including the use of pressure regulators.

The use of low-pass filters in radiotelephones is well known and effective. It is. The frequency of the transmitter pulses is typically less than 200Hz. This low frequency Resistors and capacitors included in the low-pass filter necessary to enrich the number The physical size of will be very large. As wireless telephones become smaller 1 Constraints on the size of individual constructs are becoming more stringent and therefore lower The use of pass-pass filters is impractical.

Voltage regulators consume power and have a voltage drop at the output of the regulator. cause below. The power supply within a portable radiotelephone typically has a voltage range of 7.2 volts or less. Each voltage drop across the voltage regulator is significant, since it is limited to The voltage regulator is required to reduce voltage fluctuations on the VCO supply. ing. The drop in each regulator results in VCO 203 operating. Therefore, the effective supply voltage that can be These voltage regulators must be restricted in the path to and from CO203. No.

FIG. 1 is a block diagram of a device including a VCOIOI as known in the art.

The VCO supply 1110 includes a number of regulators 107, 108.106, and therefore the usable voltage range for VCO101 is It's narrowed. vcoioi and buffer amplifier 102 are well known in the art. It has a structure of "accumulation" of knowledge. In this case [0 oscillation using stacked J configuration] By reusing the buffer amplifier current to power the device lO1, The overall supply current is reduced. This configuration achieves significant power savings The result is that it considerably limits the range of supply voltages. voltage regulator must be maintained to eliminate any voltage fluctuations in the power supply. determined by the desired supply removal.

Therefore, you can easily Portable radiotelephones and TDMA radiotelephone systems that can operate well 760 circuits are needed for use in

Summary of the invention The invention encompasses a radiotelephone with an oscillator and a buffer amplifier. . This radiotelephone includes a means for generating electric power and a battery obtained from the electric power generating means. means for supplying a bias signal to an oscillator; and means for supplying said bias signal to an oscillator. and means for reducing audible frequency noise in said means.

Brief description of the drawing FIG. 1 shows a stacked J VCO and buffer amplifier block known in the art. It is a lock diagram.

Figure 2 shows wireless telephone communications that can use the invention Figure 3 shows that the invention can be used is a block diagram of a “stacked” vCO and buffer amplifier that can be Ru.

Figure 4 shows a "stacked" VCO and buffer that can use the present invention. FIG. 2 is a circuit diagram of an amplifier.

Figure 5A shows the response from the power supply to the VCO to implement the block diagram of Figure 1. It is a simulated diagram.

FIG. 5B is a block diagram for implementing the block diagram of FIG. 3 in which the present invention can be used. Figure 2 shows a block diagram of a radio frequency transmission system. It is a diagram.

Fixed area transceiver 209 transmits and also connects portable radiotelephone 208. is within the service area of transceiver 209, portable radio telephone 2 Receives radio frequency signals from 08. The portable wireless telephone 208 is , transmitter 206. Receiver 205. Antenna 21O3VC0203, buffer amplification Vessel 211. Synthesizer 202, control logic for the synthesizer 204. oh and a reference oscillator 201. Portable wireless telephone 208 and transceiver The RF signals transmitted between the 209 and the system are Therefore, this is the selected frequency. This frequency is used within radiotelephone 208 as a reference source. It is generated by the shaker 201. The frequency generated from the reference oscillator 201 is is modified by synthesizer 202 and input to VCO 203 . control lo The logic 204 causes the synthesizer 202 to set the frequency of the reference oscillator 201 to a desired level. Provides the frequency information necessary to convert to 00 frequency. The power supply 207 is a wireless It is coupled to all devices within handset 208. The output of VCO203 is buffered The output of the buffer amplifier 211 is supplied to the transmitter 206 and and is input to the receiver 205. Depending on the frequency input to the receiver 205, A transmitter 205 receives signals from a transceiver 209 and is coupled by an antenna 210. The received radio frequency signal can be demodulated. Electrical radio frequency signal demodulated and a recognizable data format for use by the rest of the radiotelephone 208. converted into a cut. Supplied from the buffer increaser 211 to the transmitter 206 The frequency is used to modulate the data input to transmitter 206. Transmitter 206? Their outputs are coupled to antenna 210, which in turn in fixed area transceiver 209. converting electrical radio frequency signals into radio frequency signals for use in

Figure 3 shows a battery 1310, 5VC○301, and a battery that can use the present invention. FIG. 2 is an overall block diagram of a configuration in which an amplifier 302 is configured in a stacked J configuration. . Making “Stacked” Buffer Amplifier 302 and VCO 301 Power Efficient Its use as a construct is not new.

Here, two features of the present invention are that the "stacked" configuration is It is further used to separate 310.

The configuration of the preferred embodiment includes a power supply 310, at least three voltage regulators 307, 308,306. 306 actually includes regulators no, 1. Re Legs associated with FIG. 1, including regulator nO12 and regulator no, N controller No., N-1, and therefore we understand that the configuration in Figure 3 is the same as the configuration in Figure 1. Note that there is one less voltage regulator than the one shown in Figure 3. Amplifier 302. VCO301, resistors 303, 304, 305 and capacitors It also includes data 309. The power signal is.

Regulator no.l 307. regulator no, 2308, and regulator It passed through data no. N-1306. This power signal follows two paths. and is led to VOC301.

The first path is directly into buffer amplifier 302.

Used to power buffer amplifiers. and.

The power supply signal is tapped off from the buffer amplifier 302 and is tapped off from the VC Supplies power to O310.

The second path for the power signal in FIG. Bias signal for both CO301. Resist the power signal! For #305 and connect capacitor 309 to the voltage supply signal at the output of resistor W305 and the electrical and ground in parallel. The bias signal for the buffer amplifier is a resistor is derived by the power signal at the output of device 305. The output of resistor 305 is It is also input to resistor 304 . The output of resistor 304 is tied to electrical ground. Resistance! It is input to #303. The bias signal for VC0301 is connected to resistor 30 It is derived by the output of 4.

The difference between FIG. 1 and FIG. 3 is that the voltage regulator no.

This is because N is reduced by one and capacitor 309 is added.

By adding capacitor 309, the combination of resistor 305 and capacitor 309 The combination forms a large RC time constant, and this RC time constant is such that the high frequency component It acts to prevent the passage of Then select an appropriate RC constant Prevents voltage fluctuations caused by sending pulses to the transmitter 206 by It becomes possible to design the second route so as to. Figure 3 shows the overall block diagram. is a block diagram and is limited to a particular buffer amplifier 302 or a particular VC0301. RC bias formed by resistor 305 and capacitor 309 type network to any transmitter hull rate not exceeding 10kHz. It can be adjusted.

FIG. 4 is a circuit diagram of a specific implementation of the general embodiment illustrated in FIG. child In this example, the buffer amplifier is defined by transistors 401, 402, and 403. A double cascade buffer amplifier is defined. These transistors 401, 402.403 is approximately 200H2 in this example. Noise components can be removed satisfactorily at the feeding rate. of transistor 403 The output is the power signal supplied to the VCO 301 after removal of power fluctuations. The second path is connected to buffer amplifier 302 and VCO 301 by voltage w407. It is generated in response to the bias signal. for buffer amplifier 302 The bias signal is generated by a voltage divider including resistor 405 and resistor 411. It will be done. The bias signal for VCO 301 is provided by transistors 413.41'5, It is formed by a series of voltage dividers including 417 and 419. Add capacitor 406 In addition, along with resistor 405, the frequency greater than 100 Hz contained on the bias signal Obtain the RC time constant to remove the frequency and apply the bias input to the VCO 301. against.

By appropriately attenuating fluctuations in the power 1407 caused by transmitter pulses, Stabilizes the frequency output from VCO301 for proper operation within the system do. In this example, capacitor 406 has a value of 4.7 μF and resistor 406 has a value of 5 μF. It has a value of 60 ohms.

FIG. 5A shows the respective vias in buffer amplifier 11i 302 and VCO 301. through a resistor 405 that provides a signal. FIG. 4 is a diagram of the frequency response of power supply 407. . In this configuration, by removing capacitor 406 from the circuit of FIG. , is about 3 dB below the peak at about 9 kHz.

FIG. 5B shows the buffer amplification W302 and V It is a diagram up to the bias signal of CO301. This configuration has a value of 4.7μF. A capacitor 406 was included in the circuit illustrated in FIG. In 503 The frequency that is 3 dB lower than the maximum value is approximately 40 Hz, and At a supply rate of 505, it is approximately 20 dB below its maximum value and therefore the capacitance The addition of the filter 406 provides an additional 20 dB of noise rejection at the transmitter pulse frequency. Note that the result is .

Prisoner's Clothing Ding I6-5A abstract A radio telephone (208) for use in a radio telephone system, comprising an oscillator (20 3) and a wireless telephone equipped with a B sofa extension (21n) and a transmitter (206). , a pulse is supplied to the transmitter (206), and the electric current)IIK (207)GkooI/) Audible frequency voltage fluctuations occur. Wireless telephone fi (208) & Yo1 oscillator (20 3) Generate power and noise signals for /< buffer amplifier (211,) and oscillator (203) G, which have a "stacked" configuration. No ＼ Tsufa Masukushihata The power and noise generated for the oscillator (203) Reduces audio frequency voltage fluctuations caused by ) Make it less.

Claims (10)

[Claims] 1. A radiotelephone comprising an oscillator: means for generating electrical power; providing a bias signal to the oscillator obtained from the means for generating power; means; and The means for supplying the bias signal to the oscillator is configured to generate a large amount of audio frequency noise. a means for reducing the width of the radiotelephone. 2. The radiotelephone of claim 1, further comprising: buffer amplifier; means for supplying power from the power generation means to the buffer amplifier; means for supplying power obtained from the power of a buffer amplifier to said oscillator; and the means for supplying power to the oscillator to reduce audio frequency noise; means; A wireless telephone characterized by comprising: 3. 2. The radio telephone according to claim 1, wherein the oscillator is a voltage controlled oscillator. A wireless telephone characterized by: 4. 2. The wireless telephone according to claim 1, wherein the buffer amplifier is a double-terminated capacitor. A radiotelephone characterized by comprising a cade amplifier. 5. The radiotelephone according to claim 1, wherein the radiotelephone further comprises: CLAIMS 1. A wireless telephone comprising an access (TDMA) wireless telephone. 6. 2. The radiotelephone of claim 1, wherein the audio frequency noise is substantially 1 A wireless telephone characterized in that the frequency is less than 0 KHz. 7. comprising a power source and a transmitter, the transmitter transmitting a signal at a predetermined frequency below 10 KHz; A predetermined frequency is generated by emitting a pulse and loading it into the power supply. A device that causes a voltage variation in number; buffer amplifier; means for supplying power from a power source to the buffer amplifier; an oscillator; means for providing bias signals from a power supply to the oscillator and the buffer amplifier; Dan; means coupled to the buffer amplifier for powering the oscillator; means for reducing voltage fluctuations from the means for providing a bias signal to the oscillator; and, means for reducing voltage fluctuations from the means for powering the oscillator; A device characterized by comprising: 8. 8. Apparatus as claimed in claim 7, in which: Said means for reducing voltage fluctuations further includes said buffer between a power supply and said oscillator. a roll-off frequency not exceeding 10 KHz included on the first path within the amplifier; at least one resistor forming a network having a number of resistors; 1. A device comprising: two cavacitors. 9. 8. The apparatus of claim 7, wherein fluctuations in voltage from said power supply means are reduced. The means further comprises: a buffer on a second path between a power supply and the oscillator; characterized in that it comprises at least one transistor contained within the amplifier; A device used as a sign. 10. 9. The apparatus of claim 8, wherein the at least one resistor and at least one Both capacitors include one resistor having first and second ends, and a first resistor having first and second ends. and a capacitor having a second end, the first end of the resistor an end of the capacitor is coupled to a first output of a power supply and the first end of the capacitor is coupled to a first output of a power supply; a portion coupled to the second end of the resistor and the first input of the oscillator. and further, the second end of the capacitor is coupled to electrical ground. A device characterized by: