CN107231130A - The upconverter of fusion structure is switched based on mutual conductance pipe local oscillator - Google Patents
The upconverter of fusion structure is switched based on mutual conductance pipe local oscillator Download PDFInfo
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- CN107231130A CN107231130A CN201710372268.1A CN201710372268A CN107231130A CN 107231130 A CN107231130 A CN 107231130A CN 201710372268 A CN201710372268 A CN 201710372268A CN 107231130 A CN107231130 A CN 107231130A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/16—Multiple-frequency-changing
- H03D7/161—Multiple-frequency-changing all the frequency changers being connected in cascade
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Abstract
The invention discloses a kind of upconverter that fusion structure is switched based on mutual conductance pipe local oscillator, local oscillator switch is merged with mutual conductance pipe, local oscillator switch produces electric current of intermediate frequency and enters line period switching to it；RF local oscillator signal acts on local oscillator transistor by capacitive coupling, and intermediate-freuqncy signal then provides bias voltage by amplifier feedback loop for this vibration tube；Connected between bias voltage and grid by resistance, realize the isolation of local oscillation signal and intermediate-freuqncy signal；Circuit realizes input voltage and input current by way of bridging resistance at differential pair two ends and changed, so as to ensure that the higher linearity.The transistor of traditionally mixting circuit is laminated number and is reduced to two from three by the present invention, has significantly relaxed voltage margin；The actual gate voltage of local oscillator switch can be raised further for the output voltage of error amplifier and the amplitude of oscillation sum of local oscillation signal, therefore the source voltage of local oscillator switch, so as to improve the output impedance of tail current source and can accommodate the higher voltage amplitude of oscillation.
Description
Technical field
The present invention relates to a kind of upconverter, more particularly to a kind of up-conversion that fusion structure is switched based on mutual conductance pipe local oscillator
Device.
Background technology
Upconverter is a nucleus module in radio-frequency transmissions link, is responsible for moving analog baseband signal to carrier frequency
Rate, should generally possess the higher linearity to prevent output spectrum from spreading.Conventional up conversion structure is generally realized with OTA and feedback
High linearity Voltage-current conversion, is directly delivered to resistance two ends by input voltage and changes into linear current, then opened by local oscillator
Close level and frequency-domain transform is carried out to electric current.Traditional structure has been laminated current source, transconductance stage, local oscillator switching stage and born respectively from top to bottom
Carry level.Under nearly threshold voltage condition, OTA output voltage must be not less than two overdrive voltages, threshold voltage, input letter
Number amplitude of oscillation sum.In view of being remained between OTA output voltage and supply voltage in part pressure drop, the structure would become hard to acquisition can
The voltage margin of normal work.If tail current source is biased in into linear zone and reduction signal swing with holding circuit function,
Conversion gain and the linearity will face serious deterioration.
The content of the invention
Goal of the invention：For problem above, the present invention proposes a kind of upper change that fusion structure is switched based on mutual conductance pipe local oscillator
Frequency device, can be operated under below 0.6V supply voltage and keep higher conversion gain and the linearity.
Technical scheme：To realize the purpose of the present invention, the technical solution adopted in the present invention is：One kind is based on mutual conductance pipe sheet
Shake and switch the upconverter of fusion structure, including local oscillator switch and mutual conductance pipe, local oscillator switch couples for RC, during local oscillator switch is produced
Frequency electric current simultaneously enters line period switching to it；Local oscillation signal acts on transistor by capacitive coupling, and intermediate-freuqncy signal passes through fortune
Put feedback loop and provide bias voltage for transistor；Connected between bias voltage and transistor gate by resistance, realize this
The isolation for signal and the intermediate-freuqncy signal of shaking；Circuit realizes that input voltage-electric current turns by way of bridging resistance at differential pair two ends
Change.
The upconverter of fusion structure, including the first N-type MOS transistor, second are switched based on mutual conductance pipe local oscillator
N-type MOS transistor, the 3rd N-type MOS transistor, the 4th N-type MOS transistor, the 5th N-type gold
Belong to oxide transistor, the 6th N-type MOS transistor, the first error amplifier, the second error amplifier, the first electricity
Resistance, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity,
Five electric capacity, the 6th electric capacity, the 7th electric capacity, the first inductance and the second inductance.
Wherein, the source ground of the first N-type MOS transistor, the grid of the first N-type MOS transistor
The first bias voltage is connect, the drain electrode of the first N-type MOS transistor connects the negative input end of the first error amplifier；First misses
The positive input termination input intermediate-freuqncy signal positive pole of poor amplifier, the negative pole of the output termination second resistance of the first error amplifier；
The positive pole of second resistance connects the grid of the 3rd N-type MOS transistor, and the source electrode of the 3rd N-type MOS transistor connects
The drain electrode of first N-type MOS transistor, the drain electrode of the 3rd N-type MOS transistor is connecting frequency mixer output just
Pole；The positive termination local oscillation signal negative pole of second electric capacity, the negative terminal of the second electric capacity connects the grid of the 3rd N-type MOS transistor
Pole；The source electrode of 4th N-type MOS transistor connects the drain electrode of the first N-type MOS transistor, the 4th N-type metal oxygen
The drain electrode of compound transistor connects frequency converter output negative pole, and the grid of the 4th N-type MOS transistor connects 3rd resistor
Positive pole, the negative pole of 3rd resistor connects the output end of the first error amplifier；The positive pole of 3rd electric capacity connects local oscillation signal positive pole, the 3rd
The negative pole of electric capacity connects the grid of the 4th N-type MOS transistor；The source ground of second N-type MOS transistor,
The grid of second N-type MOS transistor connects the first bias voltage, and the drain electrode of the second N-type MOS transistor connects
The positive pole of one resistance, the negative pole of first resistor connects the drain electrode of the first N-type MOS transistor；The positive pole of first electric capacity connects
The drain electrode of one N-type MOS transistor, the negative pole of the first electric capacity connects the drain electrode of the second N-type MOS transistor；The
The negative input of two error amplifiers terminates the drain electrode of the second N-type MOS transistor, the positive input of the second error amplifier
The negative pole of termination input intermediate-freuqncy signal；The negative pole of output the 5th resistance of termination of second error amplifier, the positive pole of the 5th resistance
Connect the grid of the 6th N-type MOS transistor；The source electrode of 6th N-type MOS transistor connects the second N-type metal oxygen
The drain electrode of compound transistor, the drain electrode of the 6th N-type MOS transistor connects frequency converter output negative pole；5th electric capacity is just
Pole connects local oscillation signal negative pole, and the negative pole of the 5th electric capacity connects the grid of the 6th N-type MOS transistor；5th N-type metal oxygen
The source electrode of compound transistor connects the drain electrode of the second N-type MOS transistor, the drain electrode of the 5th N-type MOS transistor
Frequency converter output cathode is connected, the grid of the 5th N-type MOS transistor connects the negative pole of the 4th resistance, and the 4th resistance is just
Pole connects the output end of the second error amplifier；The positive pole of 4th electric capacity connects local oscillation signal positive pole, and the negative pole of the 4th electric capacity meets the 5th N
The grid of type MOS transistor；The positive pole of first inductance connects frequency converter output cathode, and the negative pole of the first inductance connects electricity
Source；The positive pole of 6th electric capacity connects frequency converter output cathode, and the negative pole of the 6th electric capacity connects power supply；The positive pole of second inductance connects change
Frequency device output negative pole, the negative pole of the second inductance connects power supply；The positive pole of 7th electric capacity connects frequency converter output negative pole, the 7th electric capacity
Negative pole connects power supply.
Beneficial effect：The present invention has the following effects that relative to prior art：(1) mutual conductance pipe/local oscillator switch is proposed to melt
Thought is closed, the problem of conventional linear mutual conductance upconverter can not work under low voltage condition is solved；(2) local oscillator switch
Actual gate voltage is the output voltage of error amplifier and the amplitude of oscillation sum of local oscillation signal, even if therefore error amplifier output
Voltage is limited by supply voltage, and the source voltage of local oscillator switch still can be increased to half of supply voltage or so, so that
Improve the output impedance of tail current source and the more high input voltage amplitude of oscillation can be accommodated.
Brief description of the drawings
Fig. 1 is the up-converter circuits figure of the present invention that fusion structure is switched based on mutual conductance pipe local oscillator；
Fig. 2 is the time domain beamformer of input signal of the present invention, mutual conductance resistance both end voltage and local oscillator tube grid voltage.
Embodiment
Technical scheme is further described with reference to the accompanying drawings and examples.
It is the upconverter of the present invention that fusion structure is switched based on mutual conductance pipe local oscillator as shown in Figure 1, local oscillator is opened
The function and mutual conductance pipe of pass are merged, and local oscillator switch is RC coupled modes, and RF local oscillator signal is by being capacitively coupled to local oscillator
Tube grid, and error amplifier is then by the bias voltage of this vibration tube of coupling resistance dynamic regulation, to ensure in resistance two ends
Frequency voltage is consistent with input signal, so that the electric current for flowing through local oscillator switch is directly proportional to input voltage.Due to intermediate frequency letter
Number and local oscillation signal frequency phase-difference great disparity, the leakage signal of local oscillation signal to OTA output ends can be by the filtered electrical at resistance two ends
Have effect to remove；And the coupling resistance for having higher resistance value between OTA output voltages and local oscillation signal is isolated, it is to avoid signal
Between interference.
As shown in figure 1, low-voltage is operable with based on the upconverter that mutual conductance pipe local oscillator switchs fusion structure, including：The
One N-type MOS transistor (hereinafter referred to as NMOS tube) N1, the second NMOS tube N2, the 3rd NMOS tube N3, the 4th NMOS tube
N4, the 5th NMOS tube N5, the 6th NMOS tube N6, the first error amplifier A1, the second error amplifier A2, first resistor R1,
Two resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3,
Four electric capacity C4, the 5th electric capacity C5, the 6th electric capacity C6, the 7th electric capacity C7, the first inductance L1, the second inductance L2.
Wherein, the first NMOS tube N1 source ground, N1 grid connects the first bias voltage, and N1 drain electrode connects the first error
Amplifier A1 negative input end；First error amplifier A1 positive input termination input intermediate-freuqncy signal positive pole, A1 output termination
Second resistance R2 negative pole；Second resistance R2 positive pole connects the 3rd NMOS tube N3 grid, and N3 source electrode connects N1 drain electrode, N3's
Drain electrode connects frequency mixer output cathode；Second electric capacity C2 positive termination local oscillation signal negative pole, C2 negative terminal connects N3 grid；4th
NMOS tube N4 source electrode connects N1 drain electrode, and N4 drain electrode connects frequency converter output negative pole, and N4 grid is meeting 3rd resistor R3 just
Pole, R3 negative pole connects A1 output end；3rd electric capacity C3 positive pole connects local oscillation signal positive pole, and C3 negative pole connects N4 grid；The
Two NMOS tube N2 source ground, N2 grid connects the first bias voltage, and N2 drain electrode connects first resistor R1 positive pole, and R1's is negative
Pole connects N1 drain electrode；First electric capacity C1 positive pole connects N1 drain electrode, and C1 negative pole connects N2 drain electrode；Second error amplifier A2's
Negative input terminates N2 drain electrode, the negative pole of A2 positive input termination input intermediate-freuqncy signal；A2 the 5th resistance R5's of output termination
Negative pole, R5 positive pole connects the 6th NMOS tube N6 grid；6th NMOS tube N6 source electrode connects N2 drain electrode, and N6 drain electrode connects change
Frequency device output negative pole；5th electric capacity C5 positive pole connects local oscillation signal negative pole, and C5 negative pole connects N6 grid；5th NMOS tube N5's
Source electrode connects N2 drain electrode, and N5 drain electrode connects frequency converter output cathode, and N5 grid connects the 4th resistance R4 negative pole, the 4th resistance
R4 positive pole connects A2 output end；4th electric capacity C4 positive pole connects local oscillation signal positive pole, and C4 negative pole connects N5 grid；First electricity
Sense L1 positive pole connects frequency converter output cathode, and L1 negative pole connects power supply；6th electric capacity C6 positive pole is connecting frequency converter output just
Pole, C6 negative pole connects power supply；Second inductance L2 positive pole connects frequency converter output negative pole, and L2 negative pole connects power supply；7th electric capacity
C7 positive pole connects frequency converter output negative pole, and C7 negative pole connects power supply.
The present invention assigns the double action of the mutual conductance of local oscillator switch intermediate frequency and local oscillator switch, on the one hand by reducing transistor
Stacking number directly improves voltage margin；The output voltage that another aspect is OTA due to the actual gate voltage of local oscillator switch
Can further it be raised with the source voltage of the amplitude of oscillation sum of local oscillation signal, therefore local oscillator switch, so as to improve tail current
The output impedance in source simultaneously can accommodate the higher voltage amplitude of oscillation, thereby ensure that the linearity and conversion gain.
It is illustrated in figure 2 input signal, the mutual conductance resistance of the mutual conductance pipe local oscillator switch fusion structure upconverter of the present invention
The time domain waveform of both end voltage and local oscillator tube grid voltage.As can be seen that in the presence of feedback loop, resistance two ends
Voltage follows input voltage to change all the time, it is ensured that enter electric current of intermediate frequency and input voltage holding linear relationship that local oscillator is switched.This
The signal that shakes directly acts on the grid of local oscillator switch by electric capacity, and its envelope is then by output voltage error amplifier control,
The shape of envelope is consistent substantially with input signal；The peak value of grid voltage can exceed 0.6V supply voltage, and error is put
The output voltage of big device is no more than 0.5V, and the drain voltage of tail current pipe is in more than 0.25V all the time, it is ensured that each group in circuit
State can obtain enough voltage margins.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (2)
1. a kind of upconverter that fusion structure is switched based on mutual conductance pipe local oscillator, it is characterised in that：Including local oscillator switch and mutual conductance
Pipe, local oscillator switch is RC couplings, and local oscillator switch produces electric current of intermediate frequency and enters line period switching to it；Local oscillation signal passes through electric capacity coupling
Conjunction mode acts on transistor, and intermediate-freuqncy signal provides bias voltage by amplifier feedback loop for transistor；Bias voltage with
Connected between transistor gate by resistance, realize the isolation of local oscillation signal and intermediate-freuqncy signal；Circuit passes through at differential pair two ends
The mode of bridging resistance realizes input voltage-electric current conversion.
2. the upconverter according to claim 1 that fusion structure is switched based on mutual conductance pipe local oscillator, it is characterised in that：It is described
Upconverter includes the first N-type MOS transistor (N1), the second N-type MOS transistor (N2), the 3rd N-type gold
Belong to oxide transistor (N3), the 4th N-type MOS transistor (N4), the 5th N-type MOS transistor (N5), the
Six N-type MOS transistors (N6), the first error amplifier (A1), the second error amplifier (A2), first resistor (R1),
Second resistance (R2), 3rd resistor (R3), the 4th resistance (R4), the 5th resistance (R5), the first electric capacity (C1), the second electric capacity
(C2), the 3rd electric capacity (C3), the 4th electric capacity (C4), the 5th electric capacity (C5), the 6th electric capacity (C6), the 7th electric capacity (C7), the first electricity
Feel (L1) and the second inductance (L2)；
Wherein, the source ground of the first N-type MOS transistor (N1), the first N-type MOS transistor (N1)
Grid connects the first bias voltage, and the drain electrode of the first N-type MOS transistor (N1) connects the negative of the first error amplifier (A1)
Input；First error amplifier (A1) positive input termination input intermediate-freuqncy signal positive pole, the first error amplifier (A1) it is defeated
Go out to terminate second resistance (R2) negative pole；The positive pole of second resistance (R2) connects the grid of the 3rd N-type MOS transistor (N3)
Pole, the source electrode of the 3rd N-type MOS transistor (N3) connects the drain electrode of the first N-type MOS transistor (N1), the 3rd N
The drain electrode of type MOS transistor (N3) connects frequency mixer output cathode；The positive termination local oscillation signal of second electric capacity (C2) is born
Pole, the negative terminal of the second electric capacity (C2) connects the grid of the 3rd N-type MOS transistor (N3)；4th N-type metal oxide is brilliant
The source electrode of body pipe (N4) connects the drain electrode of the first N-type MOS transistor (N1), the 4th N-type MOS transistor (N4)
Drain electrode connect frequency converter output negative pole, the grid of the 4th N-type MOS transistor (N4) is connecing 3rd resistor (R3) just
Pole, the negative pole of 3rd resistor (R3) connects the first error amplifier (A1) output end；The positive pole of 3rd electric capacity (C3) connects local oscillator letter
Number positive pole, the negative pole of the 3rd electric capacity (C3) connects the grid of the 4th N-type MOS transistor (N4)；Second N-type metal is aoxidized
The source ground of thing transistor (N2), the grid of the second N-type MOS transistor (N2) connects the first bias voltage, the 2nd N
The drain electrode of type MOS transistor (N2) connects first resistor (R1) positive pole, and the negative pole of first resistor (R1) connects the first N-type
The drain electrode of MOS transistor (N1)；The positive pole of first electric capacity (C1) connects the first N-type MOS transistor (N1)
Drain electrode, the negative pole of the first electric capacity (C1) connects the drain electrode of the second N-type MOS transistor (N2)；Second error amplifier (A2)
Negative input terminate the second N-type MOS transistor (N2) drain electrode, the second error amplifier (A2) positive input termination
Input the negative pole of intermediate-freuqncy signal；The output of second error amplifier (A2) terminates the negative pole of the 5th resistance (R5), the 5th resistance
(R5) positive pole connects the grid of the 6th N-type MOS transistor (N6)；The source of 6th N-type MOS transistor (N6)
Pole connects the drain electrode of the second N-type MOS transistor (N2), and the drain electrode of the 6th N-type MOS transistor (N6) connects change
Frequency device output negative pole；The positive pole of 5th electric capacity (C5) connects local oscillation signal negative pole, and the negative pole of the 5th electric capacity (C5) connects the 6th N-type metal
The grid of oxide transistor (N6)；It is brilliant that the source electrode of 5th N-type MOS transistor (N5) connects the second N-type metal oxide
The drain electrode of body pipe (N2), the drain electrode of the 5th N-type MOS transistor (N5) connects frequency converter output cathode, the 5th N-type gold
The grid of category oxide transistor (N5) connects the negative pole of the 4th resistance (R4), and the positive pole of the 4th resistance (R4) connects the amplification of the second error
The output end of device (A2)；The positive pole of 4th electric capacity (C4) connects local oscillation signal positive pole, and the negative pole of the 4th electric capacity (C4) connects the 5th N-type gold
Belong to the grid of oxide transistor (N5)；The positive pole of first inductance (L1) connects frequency converter output cathode, the first inductance (L1)
Negative pole connects power supply；The positive pole of 6th electric capacity (C6) connects frequency converter output cathode, and the negative pole of the 6th electric capacity (C6) connects power supply；Second
The positive pole of inductance (L2) connects frequency converter output negative pole, and the negative pole of the second inductance (L2) connects power supply；The positive pole of 7th electric capacity (C7)
Frequency converter output negative pole is connected, the negative pole of the 7th electric capacity (C7) connects power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710372268.1A CN107231130B (en) | 2017-05-24 | 2017-05-24 | Up-converter based on transconductance tube local oscillator switch fusion structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710372268.1A CN107231130B (en) | 2017-05-24 | 2017-05-24 | Up-converter based on transconductance tube local oscillator switch fusion structure |
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| CN107231130A true CN107231130A (en) | 2017-10-03 |
| CN107231130B CN107231130B (en) | 2020-06-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113114145A (en) * | 2021-05-20 | 2021-07-13 | 宜矽源半导体南京有限公司 | Low-offset differential output circuit structure |
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| CN107231130B (en) | 2020-06-30 |
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