CN113098402B - Low-power-consumption band-pass amplifying circuit with self-calibration center frequency - Google Patents
Low-power-consumption band-pass amplifying circuit with self-calibration center frequency Download PDFInfo
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- CN113098402B CN113098402B CN202110266253.3A CN202110266253A CN113098402B CN 113098402 B CN113098402 B CN 113098402B CN 202110266253 A CN202110266253 A CN 202110266253A CN 113098402 B CN113098402 B CN 113098402B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
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- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
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- H—ELECTRICITY
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Abstract
The invention relates to a low-power-consumption band-pass amplifying circuit with self-calibration of center frequency, which comprises a forward amplifying module, an output feedback module and a calibration module which are electrically connected in sequence; the forward amplification module is in a low-pass characteristic and is used for amplifying an input signal; the output feedback module is in a high-pass characteristic and is used for inhibiting low-frequency signals; the forward amplification module and the output feedback module form a band-pass amplification circuit, and the calibration module is used for correcting the central frequency of the band-pass amplification circuit during working. The input stages of the forward amplification circuit and the output feedback circuit are independent, the output stages are shared, the circuit structure is simple, and the power consumption is low; a series network of a resistor and a capacitor is used as an output load of the amplifier, and a signal on the capacitor is fed back to an input stage to form a high-pass network; the RC calibration circuit can ensure that the center frequency of the band-pass amplification circuit does not deviate along with process deviation, and the practical application requirements are met.
Description
Technical Field
The invention relates to the technical field of integrated circuit design, in particular to a low-power-consumption band-pass amplifying circuit with self-calibration of center frequency.
Background
In most communication systems or signal processing systems, signals of a specific frequency need to be amplified, and extremely low power consumption is required. In order to achieve the best communication effect and signal processing effect, the amplifier only amplifies the useful signal, and effectively suppresses direct current offset, low-frequency noise and high-frequency noise. That is, the amplifier as a whole needs to exhibit band pass characteristics, and the center frequency needs to be stably controlled without causing large offset due to process variation.
Existing bandpass filters or amplifiers are typically based on operational amplifiers. The band-pass filtering structure is formed by a combination of low-pass filtering and high-pass filtering. The gain, bandwidth and center frequency are determined by external R, C parameters.
However, since the conventional band pass filter or amplifier is generally based on an operational amplifier, the circuit structure is relatively complex, the power consumption is also relatively high, and the deviation of the R, C parameter causes the deviation of the gain, the bandwidth and the center frequency.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a low power consumption bandpass amplifier circuit with center frequency self-calibration, which has a simple structure, low power consumption, and high stability of the center frequency.
A low-power-consumption band-pass amplifying circuit with self-calibration center frequency comprises a forward amplifying module, an output feedback module and a calibration module which are electrically connected in sequence; the forward amplification module is in a low-pass characteristic and is used for amplifying an input signal; the output feedback module is in a high-pass characteristic and is used for inhibiting low-frequency signals; the forward amplification module and the output feedback module form a band-pass amplification circuit, and the calibration module is used for correcting the central frequency of the band-pass amplification circuit during working.
In addition, the low-power-consumption band-pass amplifying circuit with the self-calibration center frequency provided by the invention can also have the following additional technical characteristics:
furthermore, the circuit also comprises a power supply module, wherein the power supply module comprises a first current mirror and a second current mirror which are respectively electrically connected with the power output end.
Further, the first current mirror comprises a first MOS tube, a second MOS tube and a third MOS tube which are connected through a grid; the second current mirror comprises an eighth MOS tube and a ninth MOS tube which are connected through a grid; the first MOS tube, the second MOS tube and the third MOS tube are NMOS tubes, and the eighth MOS tube and the ninth MOS tube are PMOS tubes.
Further, the forward amplification module comprises a fourth MOS transistor and a fifth MOS transistor; the grid electrode of the fourth MOS tube is electrically connected with the positive electrode of the differential input, the grid electrode of the fifth MOS tube is electrically connected with the negative electrode of the differential input, the source electrode of the fourth MOS tube is electrically connected with the source electrode of the fifth MOS tube, the drain electrode of the fourth MOS tube is electrically connected with the drain electrode of the eighth MOS tube, and the drain electrode of the fifth MOS tube is electrically connected with the drain electrode of the ninth MOS tube.
Further, the output feedback module comprises a sixth MOS transistor and a seventh MOS transistor; the grid electrode of the sixth MOS tube is electrically connected with the reference voltage input end, the grid electrode of the seventh MOS tube is electrically connected with the cathode of the differential output, the source electrodes of the sixth MOS tube and the seventh MOS tube are electrically connected with the drain electrode of the third MOS tube, the drain electrode of the sixth MOS tube is electrically connected with the drain electrode of the eighth MOS tube, and the drain electrode of the seventh MOS tube is electrically connected with the drain electrode of the ninth MOS tube.
Further, the circuit also comprises an output load electrically connected with the differential output anode, wherein the output load comprises a first resistor and a first capacitor which are connected in series.
Further, the gain from the differential input to the differential output is:
gm1 is the transconductance of the fourth MOS transistor/the fifth MOS transistor, gm2 is the transconductance of the sixth MOS transistor/the seventh MOS transistor, s is j2 pi f, Cm is the first capacitor, and R1 is the first resistor.
Further, the calibration module comprises a comparator and an RC calibration unit which are electrically connected with the successive approximation logic control unit, and a constant current source for supplying power to the calibration module.
Further, the RC calibration unit comprises a second resistor and a second capacitor connected with the second resistor in parallel, and the second capacitor is composed of a binary capacitor array.
Further, when the calibration module is at the first moment, the constant current source charges the second capacitor, and the ramp voltage of the comparator is linearly increased from zero; and when the calibration module is used at the second moment, the ramp voltage of the comparator is increased to the reference voltage, and the calibration is carried out by a binary search method during the calibration.
The low-power-consumption band-pass amplification circuit with the self-calibration center frequency comprises a forward amplification module, an output feedback module and a calibration module which are electrically connected in sequence; the forward amplification module is in a low-pass characteristic and is used for amplifying an input signal; the output feedback module is in a high-pass characteristic and is used for inhibiting low-frequency signals; the forward amplification module and the output feedback module form a band-pass amplification circuit, and the calibration module is used for correcting the central frequency of the band-pass amplification circuit during working. The invention comprises a forward amplifying circuit and an output feedback circuit; the input stages of the forward amplification circuit and the output feedback circuit are independent, the output stages are shared, the circuit structure is simple, and the power consumption is low; a series network of a resistor and a capacitor is used as an output load of the amplifier, and a signal on the capacitor is fed back to an input stage to form a high-pass network; the RC calibration circuit can ensure that the center frequency of the band-pass amplification circuit does not deviate along with process deviation, and the practical application requirements are met.
Drawings
Fig. 1 is a block diagram of a low-power-consumption bandpass amplifier circuit with center frequency self-calibration according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a low-power-consumption bandpass amplifier circuit with center frequency self-calibration according to an embodiment of the present invention;
fig. 3 is an amplitude-frequency diagram of a low-power consumption bandpass amplifier circuit with center frequency self-calibration according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a calibration module in the low-power-consumption bandpass amplifier circuit with center frequency self-calibration according to the embodiment of the present invention;
FIG. 5 is a circuit diagram of the binary capacitor array of FIG. 4;
fig. 6 is a schematic diagram of a working process of a calibration module in the low-power-consumption bandpass amplification circuit with center frequency self-calibration provided by the embodiment of the invention.
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
In order to make the objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "left," "right," "up," "down," and the like are for illustrative purposes only and do not indicate or imply that the referenced device or element must be in a particular orientation, constructed or operated in a particular manner, and is not to be construed as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1 to fig. 3, based on the above problems, an embodiment of the present invention discloses a low power consumption bandpass amplifier circuit with self-calibration of center frequency, which includes a forward amplifier module 10, an output feedback module 20, and a calibration module 30, which are electrically connected in sequence.
Specifically, the forward amplifying module 30 has a low-pass characteristic, and is configured to amplify an input signal. The output feedback module 20 has a high-pass characteristic and is used for suppressing a low-frequency signal. The forward amplifying module 10 and the output feedback module 20 form a band-pass amplifying circuit, and the calibration module 30 is configured to correct a center frequency of the band-pass amplifying circuit during operation.
Furthermore, the circuit also comprises a power supply module, wherein the power supply module comprises a first current mirror and a second current mirror which are respectively electrically connected with the power output end.
The first current mirror comprises a first MOS transistor M1, a second MOS transistor M2 and a third MOS transistor M3 which are connected through a grid electrode; the second current mirror comprises an eighth MOS tube M8 and a ninth MOS tube M9 which are connected through a grid electrode. The sources of the first MOS transistor M1, the second MOS transistor M2 and the third MOS transistor M3 are grounded. The drains of the eighth MOS transistor M8 and the ninth MOS transistor M9 are grounded. The first MOS transistor M1, the second MOS transistor M2, and the third MOS transistor M3 are all NMOS transistors, and the eighth MOS transistor M8 and the ninth MOS transistor M9 are all PMOS transistors.
Further, the forward amplifying module 10 includes a fourth MOS transistor M4 and a fifth MOS transistor M5. The gate of the fourth MOS transistor M4 is electrically connected to the positive electrode VIP of the differential input, the gate of the fifth MOS transistor M5 is electrically connected to the negative electrode VIN of the differential input, the source of the fourth MOS transistor M4 is electrically connected to the source of the fifth MOS transistor M5, the drain of the fourth MOS transistor M4 is electrically connected to the drain of the eighth MOS transistor, and the drain of the fifth MOS transistor M5 is electrically connected to the drain of the ninth MOS transistor M9. It is understood that the output of M2 provides a current bias to the differential input pair of M4, M5, the output of M3 provides a current bias to the differential input pair of M7, M6, and the differential input pair of M4, M5 is the input stage of the forward amplifier circuit. The differential input pair of M6 and M7 is the input stage of the output feedback circuit.
Further, the output feedback module 20 includes a sixth MOS transistor M6 and a seventh MOS transistor M7. The gate of the sixth MOS transistor M6 is electrically connected to a reference voltage input terminal VREF, the gate of the seventh MOS transistor M7 is electrically connected to the negative electrode VON of the differential output, the sources of the sixth MOS transistor M6 and the seventh MOS transistor M7 are both electrically connected to the drain of the third MOS transistor M3, the drain of the sixth MOS transistor M6 is electrically connected to the drain of the eighth MOS transistor M8, and the drain of the seventh MOS transistor M7 is electrically connected to the drain of the ninth MOS transistor M9.
The circuit also includes an output load electrically connected to the differential output positive VOP, the output load including a first resistor R1 and a first capacitor Cm connected in series.
The gain from differential input to differential output is:
gm1 is the transconductance of the fourth MOS transistor/the fifth MOS transistor, gm2 is the transconductance of the sixth MOS transistor/the seventh MOS transistor, s is j2 pi f, Cm is the first capacitor, and R1 is the first resistor.
It will be appreciated that the gain of the amplifier exhibits a bandpass characteristic, the center frequency of which is determined by the RC product, and the amplitude-frequency characteristic of the gain is shown in figure 3.
Further, referring to fig. 4 to 6, the calibration module 30 includes a comparator comp electrically connected to the successive approximation logic control unit sar _ logic, an RC calibration unit, and a constant current source I for supplying power to the calibration module. The RC calibration unit comprises a second resistor R2 and a second capacitor Cn connected with the second resistor R2 in parallel, and the second capacitor Cn is composed of a binary capacitor array. When the calibration module is at the first moment, the constant current source charges the second capacitor, and the ramp voltage of the comparator is linearly increased from zero; and when the calibration module is used at the second moment, the ramp voltage of the comparator is increased to the reference voltage, and the calibration is carried out by a binary search method during the calibration.
Specifically, since the capacitor Cn is formed by a binary capacitor array, the default control word RC <4:0> is 10000, and the RC product is just equal to Ton, that is, the circuit is designed to satisfy the following condition:
at the time t1, the constant current source I charges the capacitor Cm, and the Vramp voltage increases linearly from zero;
at time t2, the Vramp voltage just reaches VREF, i.e.
I*Ton＝Cm*VREF＝Cm*R*I R*Cm＝Ton
The two clocks of CLK and SW are obtained by frequency division of a crystal oscillator clock source, and Ton is a stable quantity and does not change with the process and the temperature.
In actual operation, the RC product deviates from the design value to varying degrees due to process variations. At this time, the RC product needs to be adjusted to be close to the design value through automatic calibration, and the range and precision of calibration are theoretically determined by the adjustable capacitance size and the number of control bits, but are practically limited by the precision of the control circuit and the minimum capacitance.
The actual calibration process is performed by a binary search method: if the RC product is less than the design value (Ton), Vramp reaches VREF before time t2, and the sar _ logic module detects that the comparator output CO is high at the rising edge of CLK (i.e., time t 2), sar _ logic will add 01000 to the control word and subtract 01000 otherwise. After a new control word is fed into Cm, the next comparison process is restarted at time t 3. After 4 comparisons, the RC product is calibrated to be near the target value, and if the control word has N bits, the whole calibration process requires N comparisons.
The invention provides a low-power-consumption band-pass amplification circuit with self-calibration of center frequency, which comprises a forward amplification module, an output feedback module and a calibration module which are electrically connected in sequence; the forward amplification module is in a low-pass characteristic and is used for amplifying an input signal; the output feedback module is in a high-pass characteristic and is used for inhibiting low-frequency signals; the forward amplification module and the output feedback module form a band-pass amplification circuit, and the calibration module is used for correcting the central frequency of the band-pass amplification circuit during working. The invention comprises a forward amplifying circuit and an output feedback circuit; the input stages of the forward amplification circuit and the output feedback circuit are independent, the output stages are shared, the circuit structure is simple, and the power consumption is low; a series network of a resistor and a capacitor is used as an output load of the amplifier, and a signal on the capacitor is fed back to an input stage to form a high-pass network; the RC calibration circuit can ensure that the center frequency of the band-pass amplification circuit does not deviate along with process deviation, and the practical application requirements are met.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. A low-power-consumption band-pass amplifying circuit with self-calibration center frequency is characterized by comprising a forward amplifying module, an output feedback module and a calibration module which are electrically connected in sequence; the forward amplification module is in a low-pass characteristic and is used for amplifying an input signal; the output feedback module is in a high-pass characteristic and is used for inhibiting low-frequency signals; the forward amplification module and the output feedback module form a band-pass amplification circuit, and the calibration module is used for correcting the central frequency of the band-pass amplification circuit during working;
the calibration module comprises a comparator and an RC calibration unit which are electrically connected with the successive approximation logic control unit, and a constant current source for supplying power to the calibration module; when the calibration module is at the first moment, the constant current source charges the second capacitor, and the ramp voltage of the comparator is linearly increased from zero; when the calibration module is at the second moment, the ramp voltage of the comparator is increased to the reference voltage, and the calibration is carried out by a binary search method during the calibration;
the RC calibration unit comprises a second resistor and a second capacitor connected with the second resistor in parallel, and the second capacitor is composed of a binary capacitor array.
2. The center frequency self-calibrated low-power-consumption bandpass amplifier circuit according to claim 1, wherein the circuit further comprises a power supply module, and the power supply module comprises a first current mirror and a second current mirror electrically connected to the power output terminal, respectively.
3. The center frequency self-calibration low-power consumption band-pass amplification circuit according to claim 2, wherein the first current mirror comprises a first MOS transistor, a second MOS transistor and a third MOS transistor which are connected through a grid electrode; the second current mirror comprises an eighth MOS tube and a ninth MOS tube which are connected through a grid; the first MOS tube, the second MOS tube and the third MOS tube are NMOS tubes, and the eighth MOS tube and the ninth MOS tube are PMOS tubes.
4. The center frequency self-calibration low-power consumption band-pass amplification circuit according to claim 3, wherein the forward amplification module comprises a fourth MOS transistor and a fifth MOS transistor; the grid electrode of the fourth MOS tube is electrically connected with the positive electrode of the differential input, the grid electrode of the fifth MOS tube is electrically connected with the negative electrode of the differential input, the source electrode of the fourth MOS tube is electrically connected with the source electrode of the fifth MOS tube, the drain electrode of the fourth MOS tube is electrically connected with the drain electrode of the eighth MOS tube, and the drain electrode of the fifth MOS tube is electrically connected with the drain electrode of the ninth MOS tube.
5. The center frequency self-calibration low-power consumption band-pass amplification circuit according to claim 4, wherein the output feedback module comprises a sixth MOS transistor and a seventh MOS transistor; the grid electrode of the sixth MOS tube is electrically connected with the reference voltage input end, the grid electrode of the seventh MOS tube is electrically connected with the cathode of the differential output, the source electrodes of the sixth MOS tube and the seventh MOS tube are electrically connected with the drain electrode of the third MOS tube, the drain electrode of the sixth MOS tube is electrically connected with the drain electrode of the eighth MOS tube, and the drain electrode of the seventh MOS tube is electrically connected with the drain electrode of the ninth MOS tube.
6. The center frequency self-calibrated low-power-consumption bandpass amplifier circuit according to claim 5, further comprising an output load electrically connected to the differential output positive electrode, the output load comprising a first resistor and a first capacitor connected in series.
7. The center frequency self-calibrated low-power-consumption band-pass amplification circuit according to claim 6, wherein the gain from the differential input to the differential output is:
gm1 is the transconductance of the fourth MOS transistor/the fifth MOS transistor, gm2 is the transconductance of the sixth MOS transistor/the seventh MOS transistor, s is j2 pi f, Cm is the first capacitor, and R1 is the first resistor.
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| US9979436B2 (en) * | 2016-08-11 | 2018-05-22 | Positron Access Solutions Corporation | Automatic gain control over copper pairs using daisy-chained amplifiers |
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