CN114614782A - Front-end amplifier and mixer fused circuit - Google Patents
Front-end amplifier and mixer fused circuit Download PDFInfo
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- CN114614782A CN114614782A CN202210184738.2A CN202210184738A CN114614782A CN 114614782 A CN114614782 A CN 114614782A CN 202210184738 A CN202210184738 A CN 202210184738A CN 114614782 A CN114614782 A CN 114614782A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/68—Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics
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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
- H03D7/12—Transference of modulation from one carrier to another, e.g. frequency-changing by means of semiconductor devices having more than two electrodes
- H03D7/125—Transference of modulation from one carrier to another, e.g. frequency-changing by means of semiconductor devices having more than two electrodes with field effect transistors
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- Power Engineering (AREA)
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Abstract
The invention belongs to the field of wireless communication chips, and relates to a circuit with a front-end amplifier and a mixer fused, which consists of a signal receiving circuit and an inverting amplifying circuit connected with the signal receiving circuit, wherein the signal receiving circuit comprises an inverter and a switch S0, the first end of the switch S0 is connected with the inverter, the second end of the switch S0 is grounded, and the third end of the switch S0 is connected with the inverting amplifying circuit; the inverting amplification circuit comprises N (N is an integer larger than or equal to 1) stages of inverting amplifiers, coupling capacitors and switches corresponding to the inverting amplifiers, the inverter receives the square wave signal and performs inverting operation, and outputs a control signal to the switch S0 and the switches corresponding to the inverting amplifiers to control the on or off of the switches. The invention skillfully combines the front-end amplifier and the mixer, can determine the direct current point without a feedback resistor, not only can increase the gain of the amplifier, but also can obviously reduce the area and the power consumption of a chip.
Description
Technical Field
The invention belongs to the field of wireless communication chips, and relates to a front-end amplifier and mixer fused circuit.
Background
In general, a receiving circuit of a wireless communication chip needs to perform front-end amplification on a received weak signal and then perform down-conversion operation by using a mixer. For human body channel communication, in order to not require a large input impedance of an amplifier, a capacitive coupling method is used. This requires a front-end amplifier with high gain, high sensitivity and low input equivalent noise, and requires no high linearity, so that an amplifier with an inverter structure can achieve a large gain. The amplifier of the traditional inverter structure needs a feedback resistor to determine a direct current point, and the larger the feedback resistor is, the larger the gain of the amplifier is, but the cost of chip area is generated.
Disclosure of Invention
In order to solve the above technical problems in the prior art, the present invention provides a circuit with a front-end amplifier and a mixer integrated, and the specific technical solution is as follows:
a front-end amplifier and mixer fused circuit is composed of a signal receiving circuit and an inverting amplifying circuit connected with the signal receiving circuit, wherein the signal receiving circuit comprises an inverter and a switch S0, the first end of the switch S0 is connected with the inverter, the second end of the switch S0 is grounded, and the third end of the switch S0 is connected with the inverting amplifying circuit; the inverting amplification circuit comprises N (N is an integer larger than or equal to 1) stages of inverting amplifiers, coupling capacitors and switches corresponding to the inverting amplifiers, the inverter receives the square wave signal and performs inverting operation, and outputs a control signal to the switch S0 and the switches corresponding to the inverting amplifiers to control the on or off of the switches.
Further, in the inverting amplifier circuit, one end of a 1-stage coupling capacitor C1 is connected to the third end of the switch S0 and receives an FSK signal input from the outside, the other end of the 1-stage coupling capacitor C1 and one end of the 1-stage switch S1 are connected to the input end of the 1-stage inverting amplifier a1, the other end of the 1-stage switch S1 and the output end of the 1-stage inverting amplifier a1 are connected to one end of the 2-stage coupling capacitor C2, the other end of the 2-stage coupling capacitor C2 and one end of the 2-stage switch S2 are connected to the input end of the 2-stage inverting amplifier a2, and the output end of the 2-stage inverting amplifier a2 is connected to the 3-stage coupling capacitors and, in turn, connected to the nth-stage inverting amplifier circuit in the same structure.
Furthermore, the inverting amplifier is composed of a PMOS tube and an NMOS tube, the grids of the PMOS tube and the NMOS tube are connected to the input alternating current signal and connected with one end of the switch, the source electrode and the substrate of the PMOS tube are connected to a power supply VDD, the source electrode and the substrate of the NMOS tube are connected to the ground, and the drain electrode of the PMOS tube and the drain electrode of the NMOS tube are connected and used as output and connected with the other end of the switch.
Furthermore, the coupling capacitor is a mom capacitor and is used for transmitting alternating current signals.
Further, the inverter includes: the PMOS transistor and the NMOS transistor have grid electrodes connected to the input square wave signal, source electrodes and substrates of the PMOS transistor are connected to a power supply VDD, source electrodes and substrates of the NMOS transistor are connected to the ground, and drain electrodes of the PMOS transistor and the NMOS transistor are connected and serve as output.
Has the advantages that:
the invention innovatively uses the transmission gate to control the on-off of the feedback path, determines the direct current point when the feedback path is switched on, can determine the direct current point of the inverting amplifier without a feedback resistor, has very large amplifier gain when the feedback path is switched off, can achieve the effect of frequency mixing, skillfully fuses the frequency mixer and the front-end amplifier, reduces the power consumption and the area, and achieves good gain effect.
Drawings
FIG. 1 is a circuit schematic of the present invention;
fig. 2 is a circuit schematic of an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and technical effects of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings.
As shown in fig. 1, a front-end amplifier and mixer integrated circuit employs capacitive coupling to avoid the requirement of high input impedance of the front-end amplifier. The amplifier adopting the inverter structure controls the on-off of the negative feedback path by the switch, can achieve the maximum amplifier gain while ensuring the direct current point, and avoids the feedback resistor occupying larger area. Meanwhile, the structure can realize the function of a frequency mixer, the input FSK frequency modulation signal is subjected to down-conversion operation, the frequency mixer and a front-end amplifier are fused, and the power consumption and the area are reduced while a good gain effect is achieved.
Specifically, the circuit is composed of a signal receiving circuit and an inverting amplification circuit, and the signal receiving circuit includes: the first end of the switch S0 is connected with the inverter, the second end of the switch S0 is grounded, and the third end of the switch S0 is connected with the inverting amplification circuit; the inverting amplification circuit is composed of N (N is an integer larger than or equal to 1) stages of inverting amplifiers, and coupling capacitors and switches corresponding to the inverting amplifiers of each stage. And outputting a control signal to the switch S0 and the corresponding switch of each stage of inverting amplifier to control the switch to be switched on or off.
The inverter is used for inverting the square wave signal, outputting a control signal to the switch S0 and the switch corresponding to each stage of inverting amplifier, and controlling the switch to be switched on or switched off. The coupling capacitor adopts a mom capacitor in the chip, and plays a role in transmitting alternating current signals. The inverting amplifier amplifies the alternating current signal. The switch is controlled by a square wave signal and can control the on and off of the circuit.
In the inverting amplifying circuit, one end of a 1-stage coupling capacitor C1 is connected with the third end of a switch S0 and receives an FSK signal input from the outside, the other end of the 1-stage coupling capacitor C1 and one end of a 1-stage switch S1 are connected with the input end of a 1-stage inverting amplifier A1, the other end of the 1-stage switch S1 and the output end of the 1-stage inverting amplifier A1 are connected with one end of a 2-stage coupling capacitor C2, the other end of the 2-stage coupling capacitor C2 and one end of a 2-stage switch S2 are connected with the input end of a 2-stage inverting amplifier A2, and the output end of a 2-stage inverting amplifier A2 is connected with A3-stage coupling capacitor and is sequentially connected with the same structure to an Nth-stage inverting amplifying circuit.
The phase inverter is composed of a PMOS tube and an NMOS tube. The grid electrodes of the PMOS tube and the NMOS tube are connected to an input square wave signal, the source electrode and the substrate of the PMOS tube are connected to a power supply VDD, the source electrode and the substrate of the NMOS tube are connected to the ground, and the drain electrode of the PMOS tube and the drain electrode of the NMOS tube are connected and used as output. The inverter has a minimum size, and can invert an input square wave signal.
The inverting amplifier includes: PMOS pipe, NMOS pipe and switch. The grid electrodes of the PMOS tube and the NMOS tube are connected to an input alternating current signal and connected with one end of the switch, the source electrode and the substrate of the PMOS tube are connected to a power supply VDD, the source electrode and the substrate of the NMOS tube are connected to the ground, and the drain electrode of the PMOS tube and the drain electrode of the NMOS tube are connected and used as output and connected with the other end of the switch. The inverting amplifier may invert and amplify an input ac signal.
Example (b):
fig. 2 shows a circuit embodiment of a front-end amplifier and mixer combination according to the present invention, which is applied to a human body channel communication chip receiver, and the front-end amplification and down-conversion operations are performed simultaneously on signals transmitted from a human body and electrodes. When the SW signal is high level and the SW-signal is low level, the NMOS transistor is used as a switch and is in a conducting state. The alternating current signal transmitted from the INPUT terminal INPUT is connected to the ground, no alternating current signal is transmitted to the next stage through the coupling capacitor C1, and the transmission gate T1 is used as a switch to connect the output and the INPUT of the inverting amplifier in a conducting state, thereby forming negative feedback and fixing a direct current point. When the SW signal is low (i.e. the SW-signal is high), the NMOS transistor is turned off, the path from the input ac signal to the ground is cut off, and the input ac signal can be transmitted to the next stage through the coupling capacitor C1. Since the transmission gate T1 is turned off at this time, the negative feedback of the inverting amplifier a1 disappears, and therefore it can perform the inverting amplification of the ac signal with the maximum gain. Since the dc point was established by the inverting amplifier at the last time (when the SW signal was high), the voltage across the capacitor cannot change abruptly, and thus the amplification of the inverting amplifier is still performed at this dc point. The coupling capacitors C2 and C3, the inverting amplifiers A2 and A3 and the transmission gates T2 and T3 have the same functions.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Although the foregoing has described the practice of the present invention in detail, it will be apparent to those skilled in the art that modifications may be made to the practice of the invention as described in the foregoing examples, or that certain features may be substituted in the practice of the invention. All changes, equivalents and the like which come within the spirit and principles of the invention are desired to be protected.
Claims (5)
1. A front-end amplifier and mixer fused circuit is composed of a signal receiving circuit and an inverting amplifying circuit connected with the signal receiving circuit, and is characterized in that the signal receiving circuit comprises an inverter and a switch S0, wherein the first end of the switch S0 is connected with the inverter, the second end of the switch S0 is grounded, and the third end of the switch S0 is connected with the inverting amplifying circuit; the inverting amplification circuit comprises N (N is an integer larger than or equal to 1) stages of inverting amplifiers, coupling capacitors and switches corresponding to the inverting amplifiers, the inverter receives the square wave signal and performs inverting operation, and outputs a control signal to the switch S0 and the switches corresponding to the inverting amplifiers to control the on or off of the switches.
2. The front-end amplifier and mixer fused circuit as claimed in claim 1, wherein in said inverting amplifier circuit, one end of a 1-stage coupling capacitor C1 is connected to the third end of the switch S0 and receives FSK signals input from outside, the other end of the 1-stage coupling capacitor C1 is connected to one end of the 1-stage switch S1 and is connected to the input end of the 1-stage inverting amplifier a1, the other end of the 1-stage switch S1 is connected to the output end of the 1-stage inverting amplifier a1 and is connected to one end of a 2-stage coupling capacitor C2, the other end of the 2-stage coupling capacitor C2 is connected to one end of the 2-stage switch S2 and is connected to the input end of the 2-stage inverting amplifier a2, and the output end of the 2-stage inverting amplifier a2 is connected to the 3-stage coupling capacitor, which are connected to the nth-stage inverting amplifier circuit in turn in the same structure.
3. The front-end amplifier and mixer fused circuit of claim 2, wherein said inverting amplifier is composed of a PMOS transistor and an NMOS transistor, the gates of the PMOS transistor and the NMOS transistor are connected to the input ac signal and to one end of the switch, the source and the substrate of the PMOS transistor are connected to VDD, the source and the substrate of the NMOS transistor are connected to ground, the drain of the PMOS transistor and the drain of the NMOS transistor are connected as the output and to the other end of the switch.
4. The front-end amplifier and mixer fused circuit of claim 1, wherein said coupling capacitor is implemented as a mom capacitor for passing ac signals.
5. The front-end amplifier and mixer fused circuit of claim 1, wherein said inverter comprises: the grid electrodes of the PMOS tube and the NMOS tube are connected to an input square wave signal, the source electrode and the substrate of the PMOS tube are connected to a power supply VDD, the source electrode and the substrate of the NMOS tube are connected to the ground, and the drain electrode of the PMOS tube and the drain electrode of the NMOS tube are connected and used as output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210184738.2A CN114614782A (en) | 2022-02-28 | 2022-02-28 | Front-end amplifier and mixer fused circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210184738.2A CN114614782A (en) | 2022-02-28 | 2022-02-28 | Front-end amplifier and mixer fused circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114614782A true CN114614782A (en) | 2022-06-10 |
Family
ID=81858935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210184738.2A Pending CN114614782A (en) | 2022-02-28 | 2022-02-28 | Front-end amplifier and mixer fused circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114614782A (en) |
-
2022
- 2022-02-28 CN CN202210184738.2A patent/CN114614782A/en active Pending
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