CN114124142B - Current multiplexing low-power consumption differential super-regenerative radio frequency front-end circuit - Google Patents

Current multiplexing low-power consumption differential super-regenerative radio frequency front-end circuit Download PDF

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CN114124142B
CN114124142B CN202111448948.XA CN202111448948A CN114124142B CN 114124142 B CN114124142 B CN 114124142B CN 202111448948 A CN202111448948 A CN 202111448948A CN 114124142 B CN114124142 B CN 114124142B
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nmos tube
low
circuit
regenerative
tube
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CN114124142A (en
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徐建
石永柳
王鑫
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Nanjing Sino Chip Microelectronics Co ltd
Southeast University
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Nanjing Sino Chip Microelectronics Co ltd
Southeast University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The invention discloses a current multiplexing low-power consumption differential super-regenerative radio frequency front-end circuit, which is formed by an LC regenerative oscillating circuit and a low-noise amplifying circuit in a vertically stacked structure, wherein the low-noise amplifying circuit adopts a common-source common-gate amplifier structure. The LC regenerative oscillating circuit is used as a load circuit of the low-noise amplifying circuit, the low-noise amplifying circuit is used as a tail current bias of the LC regenerative oscillating circuit, and the LC regenerative oscillating circuit and the low-noise amplifying circuit multiplex direct current. According to the invention, a differential short-circuit capacitance technology is introduced into a traditional current multiplexing super-regenerative radio frequency front-end circuit to convert a single-end signal output by a low-noise amplifying circuit into a differential signal, and the differential signal is injected into a differential LC regenerative oscillating circuit, so that Balun is effectively saved, common mode noise on a power supply can be well inhibited, a better power supply inhibition ratio is realized, and the problem of common mode inhibition ratio difference caused by the adoption of a single-end structure of the traditional current multiplexing super-regenerative radio frequency front-end is solved.

Description

Current multiplexing low-power consumption differential super-regenerative radio frequency front-end circuit
Technical Field
The invention relates to a differential super-regenerative radio frequency front-end circuit.
Background
Super regenerative receivers were invented by Armstrong (Armstrong) in 1922. Because of its simple structure and low cost, it is widely used in some simple wireless communication devices.
A typical super regenerative receiver is mainly composed of a receiving antenna, a low noise amplifier, a super regenerative oscillator, an envelope detection circuit, a low pass filter, an amplifying circuit, and a blanking signal generating circuit, as shown in fig. 4. The super regenerative receiver radio frequency front end consists of a low noise amplifier and a super regenerative oscillator. Wherein the super-regenerative oscillator is actually an oscillator operating in an intermittent oscillation state, and the intermittent frequency is determined by the quench signal. When no RF signal is received, the oscillator has longer oscillation starting time and small envelope area after envelope detection. When receiving the RF signal, the oscillator oscillation starting time is obviously shortened, and the envelope area is enlarged. The average voltage signal obtained by the envelope of the changes after passing through the low-pass filter will change with the presence or absence of the input signal, and the level of the change of the level is the demodulated signal.
Today, where system integration is becoming more and more common, super regenerative receivers are also moving towards high integration, low power consumption and even micro power consumption. Higher integration means that the system modules increase, and the mutual interference of the modules increases, and these mutual interference may form common mode noise on the power supply, degrading the noise performance of the receiver and further degrading the sensitivity of the receiver. In order to suppress common mode noise on a power supply, a conventional super regenerative oscillator adopts a differential structure to improve the common mode rejection ratio of the power supply. The conventional super regenerative rf front-end circuit shown in fig. 1 adopts a differential structure of a conventional super regenerative oscillator, which is connected to a dc current source respectively with a low noise amplifier.
In the super regenerative receiver system, the radio frequency front end composed of the low noise amplifier circuit and the oscillator circuit consumes most of the power consumption, so that the low power consumption design of the radio frequency front end becomes a low power consumption design bottleneck of the whole receiver. The conventional current multiplexing low-power consumption super-regenerative radio frequency front-end circuit is generally adopted, as shown in fig. 2, an LC oscillator and a low-noise amplifier are stacked up and down, direct current is multiplexed, and the low-power consumption design of the radio frequency front-end circuit is realized. That is, in the conventional current multiplexing low-power consumption super-regenerative rf front-end circuit, since the low-noise amplifier is of a single-ended structure, if no additional Balun (single-to-double) circuit is introduced, the low-noise amplifier cannot be directly stacked and combined with the differential oscillator shown in fig. 1 to realize differential output, so that the oscillator can only adopt a single-ended structure and input a single-ended oscillation signal, the problem of common-mode noise interference of a power supply cannot be solved, noise performance of a receiver is deteriorated, and sensitivity of the receiver is also deteriorated.
Disclosure of Invention
The invention aims to: aiming at the prior art, a current multiplexing low-power consumption differential super-regenerative radio frequency front-end circuit is provided, and the problem that common mode noise suppression of a power supply is reduced due to stacking of a traditional single-ended super-regenerative oscillator and a low-noise amplifier is solved.
The technical scheme is as follows: a current-multiplexed low-power differential super regenerative radio frequency front-end circuit comprising: the low-noise amplifying circuit adopts a common-source common-gate amplifier structure; the LC regenerative oscillating circuit and the low-noise amplifying circuit form an up-down stacked structure, the LC regenerative oscillating circuit is used as a load circuit of the low-noise amplifying circuit, and the low-noise amplifying circuit is used as a tail current bias of the LC regenerative oscillating circuit; the LC regenerative oscillating circuit and the low-noise amplifying circuit multiplex direct current, and the single-ended signal output by the low-noise amplifying circuit is converted into a differential signal through the differential short-circuit capacitor and is injected into the LC regenerative oscillating circuit.
Further, the LC regenerative oscillating circuit comprises a PMOS tube M1, a PMOS tube M2, a PMOS tube M7, an NMOS tube M3, an NMOS tube M4, capacitors C2-C4, an inductor L and a resistor R; the source ends of the PMOS tube M1 and the PMOS tube M2 are connected with the direct-current voltage VDD, and the gate ends are respectively connected with the drain ends of the other side to form a cross coupling state to provide negative resistance; drain ends of the PMOS tube M1 and the PMOS tube M2 are respectively connected with drain ends of the NMOS tube M3 and the NMOS tube M4, and source ends of the NMOS tube M3 and the NMOS tube M4 are connected with the output of the low-noise amplifying circuit; the capacitor C2 is connected between the gate end and the source end of the NMOS tube M3 in a bridging manner, the resistor R is connected between the gate end of the NMOS tube M3 and the gate end of the NMOS tube M4 in a bridging manner, the capacitor C3 is connected between the gate end of the NMOS tube M4 and the ground, and the gate end of the NMOS tube M4 is connected with the bias voltage VBIAS3; the capacitor C4 and the inductor L are respectively connected in parallel between the drain ends of the PMOS tube M1 and the PMOS tube M2 and the drain ends of the NMOS tube M3 and the NMOS tube M4 to form an LC resonance network; the PMOS tube M7 is connected in parallel between the drain ends of the PMOS tube M1 and the PMOS tube M2 and the drain ends of the NMOS tube M3 and the NMOS tube M4, and the gate end of the PMOS tube M7 is connected with the extinction signal QUENCH.
Further, the low noise amplifying circuit comprises an NMOS tube M5, an NMOS tube M6 and a capacitor C1; the drain end of the NMOS tube M6 is used as the output of the low noise amplifying circuit, the source end of the NMOS tube M6 is connected with the drain end of the NMOS tube M5, and the gate end of the NMOS tube M6 is connected with the bias voltage VBIAS2; the source end of the NMOS tube M5 is grounded, and the gate end is connected with bias voltage VBIAS1; one end of the capacitor C1 is connected with the gate end of the NMOS tube M5, and the other end of the capacitor C is connected with the input radiofrequency signal RFIN.
The beneficial effects are that: according to the invention, a differential short-circuit capacitance technology is introduced into a traditional current multiplexing super-regenerative radio frequency front-end circuit to convert a single-ended signal output by a low-noise amplifying circuit into a differential signal, and the differential signal is injected into a differential LC regenerative oscillating circuit, so that Balun (single-turn double) is effectively saved, common mode noise on a power supply can be well inhibited, a better power supply rejection ratio is realized, and the problem of common mode rejection ratio difference caused by the adoption of a single-ended structure in the traditional current multiplexing super-regenerative radio frequency front-end is solved.
Drawings
FIG. 1 is a circuit diagram of a conventional super regenerative RF front end employing a differential structure oscillator;
FIG. 2 is a circuit diagram of a conventional current-multiplexing low-power-consumption super-regenerative RF front-end;
FIG. 3 is a circuit diagram of a current multiplexing low power differential super regenerative RF front end of the present invention;
fig. 4 is a schematic diagram of a conventional super regenerative receiver.
Detailed Description
The invention is further explained below with reference to the drawings.
A current multiplexing low-power consumption differential super-regenerative radio frequency front-end circuit comprises an LC regenerative oscillating circuit and a low-noise amplifying circuit. As shown in FIG. 3, the LC regenerative oscillation circuit comprises a PMOS tube M1, a PMOS tube M2, a PMOS tube M7, an NMOS tube M3, an NMOS tube M4, capacitors C2-C4, an inductor L and a resistor R. The source ends of the PMOS tube M1 and the PMOS tube M2 are connected with the direct-current voltage VDD, and the gate ends are respectively connected with the drain ends of the other side, so that a cross coupling state is formed to provide negative resistance. The drain ends of the PMOS tube M1 and the PMOS tube M2 are respectively connected with the drain ends of the NMOS tube M3 and the NMOS tube M4, and the source ends of the NMOS tube M3 and the NMOS tube M4 are connected with the output of the low-noise amplifying circuit. The capacitor C2 is connected between the gate end and the source end of the NMOS tube M3 in a bridging manner, the resistor R is connected between the gate end of the NMOS tube M3 and the gate end of the NMOS tube M4 in a bridging manner, the capacitor C3 is connected between the gate end of the NMOS tube M4 and the ground in a bridging manner, and the gate end of the NMOS tube M4 is connected with the bias voltage VBIAS3. The capacitor C4 and the inductor L are respectively connected in parallel between the drain ends of the PMOS tube M1 and the PMOS tube M2 and the drain ends of the NMOS tube M3 and the NMOS tube M4 to form an LC resonance network, and when the circuit is electrified, the fine disturbance generated can be used as excitation to continuously oscillate and amplify in the resonance loop until a stable signal is formed. The PMOS tube M7 is connected in parallel between the drain ends of the PMOS tube M1 and the PMOS tube M2 and the drain ends of the NMOS tube M3 and the NMOS tube M4, and the gate end of the PMOS tube M7 is connected with a QUENCH signal QUENCH to control the QUENCH of the oscillator. When the QUENCH signal QUENCH is high, the oscillator oscillates normally; when the QUENCH signal QUENCH is low, the oscillator is quenched; the periodic starting and extinguishing of the LC regenerative oscillating circuit can be realized through the periodic QUENCH signal.
The low noise amplifying circuit comprises an NMOS tube M5, an NMOS tube M6 and a capacitor C1. The drain end of the NMOS tube M6 is used as the output of the low noise amplifying circuit, the source end of the NMOS tube M6 is connected with the drain end of the NMOS tube M5, and the gate end of the NMOS tube M6 is connected with the bias voltage VBIAS2. The source end of the NMOS tube M5 is grounded, and the gate end is connected with bias voltage VBIAS1; one end of the capacitor C1 is connected with the gate end of the NMOS tube M5, and the other end of the capacitor C is connected with the input radiofrequency signal RFIN.
In the above structure, the low noise amplifying circuit adopts a common-source common-gate amplifier structure, the LC regenerative oscillating circuit and the low noise amplifying circuit form a vertically stacked structure, the LC regenerative oscillating circuit is used as a load circuit of the low noise amplifying circuit, and the low noise amplifying circuit is used as a tail current bias of the LC regenerative oscillating circuit. The LC regenerative oscillating circuit and the low-noise amplifying circuit multiplex direct current, and alternating current converted by the radio frequency input signal through the low-noise amplifying circuit is injected into the LC regenerative oscillating circuit in a differential mode.
In the LC regenerative oscillation circuit, the gate terminal and the source terminal of the NMOS transistor M3 are coupled through the capacitor C2, which is equivalent to a short circuit in the ac path; the gate and source terminals of the NMOS transistor M4 are not capacitively coupled, and are equivalent to open circuits in the ac path. So the alternating current output signal of the low noise amplifying circuit acts on the gate end and the source end of the NMOS tube M3 at the same time, and the gate-source voltage of the NMOS tube M3 cannot be changed; the alternating current output signal of the low-noise amplifying circuit only acts on the source end of the NMOS tube M4, so that the gate-source voltage of the NMOS tube M4 is changed, namely differential input of signals is realized, and the single-ended input signal is automatically converted into differential signals and is injected into the differential LC regenerative oscillating circuit.
The current multiplexing low-power consumption differential super-regenerative radio frequency front-end circuit is formed by stacking an LC regenerative oscillating circuit and a low-noise amplifying circuit. The LC regenerative oscillating circuit includes: the device comprises a cross coupling circuit, a resonant network, a differential input circuit and a extinction circuit; the low noise amplification circuit is in a cascode configuration. All MOS tubes in the circuit are biased in a subthreshold region, and the low-noise amplifying circuit and the LC regenerative oscillating circuit multiplex direct current, and can ensure enough amplifying gain although only small current is consumed. Although the low-noise amplifying circuit and the LC regeneration type oscillating circuit share direct current, alternating current converted by the radio frequency input signal through the low-noise amplifier can still be injected into the oscillator in a differential mode, common mode noise on a power supply can be restrained, and a better power supply rejection ratio is realized.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims (2)

1. A current multiplexing low power differential super regenerative radio frequency front-end circuit, comprising: the low-noise amplifying circuit adopts a common-source common-gate amplifier structure; the LC regenerative oscillating circuit and the low-noise amplifying circuit form an up-down stacked structure, the LC regenerative oscillating circuit is used as a load circuit of the low-noise amplifying circuit, and the low-noise amplifying circuit is used as a tail current bias of the LC regenerative oscillating circuit; the LC regenerative oscillating circuit and the low-noise amplifying circuit multiplex direct current, and single-ended signals output by the low-noise amplifying circuit are converted into differential signals through a differential short-circuit capacitor and are injected into the LC regenerative oscillating circuit;
the LC regenerative oscillating circuit comprises a PMOS tube M1, a PMOS tube M2, a PMOS tube M7, an NMOS tube M3, an NMOS tube M4, capacitors C2-C4, an inductor L and a resistor R; the source ends of the PMOS tube M1 and the PMOS tube M2 are connected with the direct-current voltage VDD, and the gate ends are respectively connected with the drain ends of the other side to form a cross coupling state to provide negative resistance; drain ends of the PMOS tube M1 and the PMOS tube M2 are respectively connected with drain ends of the NMOS tube M3 and the NMOS tube M4, and source ends of the NMOS tube M3 and the NMOS tube M4 are connected with the output of the low-noise amplifying circuit; the capacitor C2 is connected between the gate end and the source end of the NMOS tube M3 in a bridging manner, the resistor R is connected between the gate end of the NMOS tube M3 and the gate end of the NMOS tube M4 in a bridging manner, the capacitor C3 is connected between the gate end of the NMOS tube M4 and the ground, and the gate end of the NMOS tube M4 is connected with the bias voltage VBIAS3; the capacitor C4 and the inductor L are respectively connected in parallel between the drain ends of the PMOS tube M1 and the PMOS tube M2 and between the drain ends of the NMOS tube M3 and the NMOS tube M4 to form an LC resonance network; the PMOS tube M7 is connected in parallel between the drain ends of the PMOS tube M1 and the PMOS tube M2 and between the drain ends of the NMOS tube M3 and the NMOS tube M4, the source end of the PMOS tube M7 is connected with the drain end of the PMOS tube M2 and the drain end of the NMOS tube M4, the drain end of the PMOS tube M7 is connected with the drain end of the PMOS tube M1 and the drain end of the NMOS tube M3, and the gate end of the PMOS tube M7 is connected with the extinction signal QUENCH.
2. The current multiplexing low-power consumption differential super-regenerative radio frequency front-end circuit according to claim 1, wherein the low-noise amplifying circuit comprises an NMOS tube M5, an NMOS tube M6 and a capacitor C1; the drain end of the NMOS tube M6 is used as the output of the low noise amplifying circuit, the source end of the NMOS tube M6 is connected with the drain end of the NMOS tube M5, and the gate end of the NMOS tube M6 is connected with the bias voltage VBIAS2; the source end of the NMOS tube M5 is grounded, and the gate end is connected with bias voltage VBIAS1; one end of the capacitor C1 is connected with the gate end of the NMOS tube M5, and the other end of the capacitor C is connected with the input radiofrequency signal RFIN.
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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016145950A1 (en) * 2015-03-18 2016-09-22 东南大学 Single-ended input and double-balanced passive mixer

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US20060264196A1 (en) * 2005-05-19 2006-11-23 Chun-Wah Fan Super-regenerative receiver with damping resistor
EP2685630B1 (en) * 2012-07-13 2014-10-22 CSEM Centre Suisse d'Electronique et de Microtechnique SA A two stage single-ended input, differential output current reuse low noise amplifier
CN104467887B (en) * 2014-11-20 2017-12-12 东南大学 A kind of dynamic bias superregenerative receiver
CN113489500B (en) * 2021-07-06 2022-09-30 东南大学 Novel variable gain super-regenerative receiver

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016145950A1 (en) * 2015-03-18 2016-09-22 东南大学 Single-ended input and double-balanced passive mixer

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