CN113589876B - Power control circuit - Google Patents
Power control circuit Download PDFInfo
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- CN113589876B CN113589876B CN202110970560.XA CN202110970560A CN113589876B CN 113589876 B CN113589876 B CN 113589876B CN 202110970560 A CN202110970560 A CN 202110970560A CN 113589876 B CN113589876 B CN 113589876B
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- 239000003990 capacitor Substances 0.000 claims description 11
- 230000000153 supplemental effect Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 241001125929 Trisopterus luscus Species 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
- G05F3/02—Regulating voltage or current
- G05F3/08—Regulating voltage or current wherein the variable is dc
- G05F3/10—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics
- G05F3/16—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices
- G05F3/20—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations
- G05F3/26—Current mirrors
Abstract
According to an embodiment of the present invention, there is provided a power control circuit including: a feedback amplifier receiving the input control voltage V1 and a feedback voltage from an output thereof, and configured to be connected to the mirror current circuit; a control switch circuit that receives an input control voltage V1 and is connected to the mirror current circuit to provide a circuit whose resistance varies with the input control voltage V1; an image current circuit connected to the output terminal of the feedback amplifier, the control switch circuit, and the output voltage generation circuit to provide an image current according to the input control voltage V1 and the resistance of the control switch circuit; an output voltage generation circuit connected to the mirror current circuit to provide a slowed output control voltage according to the received mirror current.
Description
Technical Field
The present disclosure relates to a power control circuit, and in particular, to a power control circuit that slows down a power variation curve with a control voltage in a medium-small power.
Background
A radio frequency power amplifier often requires a control voltage to control the magnitude of the output power, i.e. as the control voltage increases, the power increases. The control voltage generally increases linearly from 0V up to 2V, with a fixed accuracy in steps. However, the output power of saturated power amplifiers, such as GMSK in particular, generally does not increase linearly with increasing control voltage, and generally increases faster when the power is small and slowly when the power is large, approaching near saturated power. This results in a very steep power-to-control voltage curve at medium and low power, resulting in reduced power control accuracy.
Disclosure of Invention
The present disclosure proposes a power control circuit whose power varies slowly with the control voltage at small and medium powers, and which does not affect the magnitude of the maximum output power at high powers.
According to an embodiment of the present invention, there is provided a power control circuit including: a feedback amplifier receiving the input control voltage V1 and a feedback voltage from an output thereof, and configured to be connected to the mirror current circuit; a control switch circuit that receives an input control voltage V1 and is connected to the mirror current circuit to provide a circuit whose resistance varies with the input control voltage V1; an image current circuit connected to the output terminal of the feedback amplifier, the control switch circuit, and the output voltage generation circuit to provide an image current according to the input control voltage V1 and the resistance of the control switch circuit; an output voltage generation circuit connected to the mirror current circuit to provide a slowed output control voltage according to the received mirror current.
According to an embodiment of the present invention, there is provided a power control circuit, wherein the feedback amplifier includes an operational amplifier circuit, and wherein the operational amplifier is configured such that an-input terminal of the operational amplifier is connected to an input control voltage V1, and a +input terminal of the operational amplifier is connected to an output terminal of the operational amplifier through the mirror current circuit.
According to an embodiment of the present invention, there is provided a power control circuit, wherein the control switch circuit includes: an N-type tube N1 serving as a switch, a resistor R1, and a resistor R2, wherein a gate of the N-type tube N1 is connected to an input control voltage V1, on and off of the N-type tube N1 is controlled by the input control voltage V1, a source of the N-type tube N1 is connected to one end of the resistor R1, and a drain thereof is connected to the other end of the resistor R1 to be connected to a mirror current circuit; resistor R2 is configured in series with resistor R1, with one end connected to resistor R1 and the other end grounded.
According to an embodiment of the present invention, there is provided a power control circuit, wherein the control switch circuit further includes a filter network circuit configured to be connected between the gate of the N-type pipe N1 and the input control voltage V1 to filter out fluctuations of the input control voltage V1.
According to an embodiment of the present invention, there is provided a power control circuit, wherein the filter network circuit includes a low-pass filter, and wherein the low-pass filter includes a resistor R3 and a capacitor C1, one end of the resistor R3 is connected to an input control voltage V1 and the other end thereof is connected to the capacitor C1 and to the gate of the N-type tube N1, one end of the capacitor C1 is connected to the resistor R3 and the other end thereof is grounded.
According to an embodiment of the present invention, there is provided a power control circuit, wherein the mirror current circuit includes a P-type pipe P1 and a P-type pipe P2, wherein sources of the P-type pipes P1 and P2 are commonly connected to a power supply voltage, gates of the P-type pipes P1 and P2 are commonly connected to an output terminal of the feedback amplifier a, and a drain of the P-type pipe P1 is connected to the control switching circuit and a drain of the P-type pipe P2 is connected to an output voltage generating circuit to output an output control voltage.
According to an embodiment of the present invention, there is provided a power control circuit, wherein the output voltage generation circuit includes a resistor R4, wherein one end of the resistor R4 is connected to the mirror current circuit to output an output control voltage, and the other end thereof is grounded.
According to an embodiment of the present invention, there is provided a power control circuit, wherein the output voltage generating circuit further includes a supplementary current source I1, wherein one end of the supplementary current source I1 is connected to a power supply voltage, and the other end thereof is connected in parallel with a resistor R4 to reduce an input control voltage V1 for turning on the power amplifier.
According to an embodiment of the present invention, there is provided a power control circuit, wherein when an input control voltage V1 is low and an N-type pipe N1 is turned off, an output control voltage is
According to an embodiment of the present invention, there is provided a power control circuit, wherein when an input control voltage V1 increases and an N-type tube N1 is turned on, an output control voltage isWherein R is N1 Is the on-resistance of the N-type tube N1.
According to an embodiment of the present invention, there is provided a power control circuit in which, when an input control voltage V1 gradually increases to 1V or more, an output voltage V2 is
According to the embodiment of the invention, the curve of the medium and small power along with the change of the control voltage is slowed down, and the maximum output power is not influenced.
Drawings
FIG. 1 is a schematic diagram showing a power control circuit for slowing down a power versus control voltage curve at a medium and small power in accordance with an embodiment of the present invention;
FIG. 2 is a schematic diagram showing a power control circuit for slowing down a power versus control voltage curve at a medium and small power in accordance with an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a power control circuit and a power amplifier circuit according to an embodiment of the invention; and
fig. 4 is a graph of output power as a function of control voltage according to an embodiment of the present disclosure.
Detailed Description
Before proceeding with the following detailed description, it may be advantageous to set forth definitions of certain words and phrases used throughout this patent document. The terms "coupled," "connected," and derivatives thereof, refer to any direct or indirect communication between two or more elements, whether or not those elements are in physical contact with one another. The terms "transmit," "receive," and "communicate," and derivatives thereof, encompass both direct and indirect communication. The terms "include" and "comprise," as well as derivatives thereof, mean inclusion without limitation. The term "or" is inclusive, meaning and/or. The phrase "associated with … …" and its derivatives are intended to include, be included in, interconnect with, contain within … …, connect or connect with … …, couple or couple with … …, communicate with … …, mate, interleave, juxtapose, approximate, bind or bind with … …, have attributes, have relationships or have relationships with … …, etc. The term "controller" refers to any device, system, or portion thereof that controls at least one operation. Such a controller may be implemented in hardware, or a combination of hardware and software and/or firmware. The functionality associated with any particular controller may be centralized or distributed, whether locally or remotely. The phrase "at least one," when used with a list of items, means that different combinations of one or more of the listed items may be used, and that only one item in the list may be required. For example, "at least one of A, B, C" includes any one of the following combinations: A. b, C, A and B, A and C, B and C, A and B and C.
Definitions for other specific words and phrases are provided throughout this patent document. Those of ordinary skill in the art should understand that in many, if not most instances, such definitions apply to prior as well as future uses of such defined words and phrases.
In this patent document, the application combinations of transform blocks and the division levels of sub-transform blocks are for illustration only, and the application combinations of transform blocks and the division levels of sub-transform blocks may have different manners without departing from the scope of the present disclosure.
Figures 1 through 4, discussed below, and the various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will appreciate that the principles of the present disclosure may be implemented in any suitably arranged system or device.
Fig. 1 is a schematic diagram showing a power control circuit for slowing down a power variation curve with a control voltage at a medium and small power according to an embodiment of the present invention.
Referring to fig. 1, a power control circuit 100 includes a feedback amplifier a, a control switching circuit, a current mirror circuit, and an output voltage generation circuit. The feedback amplifier a may be constituted by an operational amplifier for receiving the input control voltage V1 and feedback from its output to provide a stable input control voltage related to the input control voltage V1. And the control switch circuit is used for adjusting the on and off of the switch according to the change of the input voltage so as to adjust the current in the control switch circuit. A current mirror circuit that provides a mirrored current of the current in the control switch circuit by mirroring the current in the control switch circuit. An output voltage generation circuit configured to provide a slowed output voltage in accordance with the mirror current.
Specifically, in fig. 1, the-input terminal of the operational amplifier a is connected to the input control voltage V1, and the output terminal thereof is connected to the gate of the P-type pipe P1 in the mirror current circuit to be feedback-connected back to the +input terminal of the operational amplifier a through the P-type pipe P1.
The control switch circuit comprises resistors R1 and R2, an N-type tube N1 and a filter network circuit. In which a resistor R1 is connected in parallel with an N-type tube N1, one end of which is connected to the + input terminal of the amplifier a, the drain terminal of the P-type tube and the drain of the N-type tube N1, and the other end of which is connected to a resistor R2 and the source of the N-type tube N1. One end of the resistor R2 is connected to the resistor R1, and the other end thereof is grounded. The N-type tube N1 is connected in parallel with the resistor R1, and the gate of the N-type tube N1 is connected to the filter network circuit to be connected to the input control voltage V1 through the filter network circuit.
The mirror current circuit includes a P-type pipe P1 and a P-type pipe P2. Wherein the sources of the P-type pipes P1 and P2 are commonly connected to a power supply voltage, the gates of the P-type pipes P1 and P2 are commonly connected to the output terminal of the feedback amplifier a, and the drain of the P-type pipe P1 is connected to the drain of the N-type pipe N1 and the drain of the P-type pipe P2 is connected to an output voltage output port.
The output voltage generation circuit includes a resistor R4. In which resistor R4 is connected at one end to the output voltage output port and at its other end to ground.
According to an embodiment of the present disclosure, the output voltage generation circuit may further include a supplementary current source I1. In which a supplementary current source I1 is connected at one end to the supply voltage and at its other end to a resistor R4 and to the output voltage output port. Since the input control voltage V1 is also used to turn on the power amplifier (e.g., turn on the power amplifier at 0.16V), to prevent the curve of V2 of the output control voltage from being too slow at low power, resulting in the turn-on voltage of the power amplifier being too large, a supplemental current source I1 is added to ensure that the turn-on voltage of the power amplifier is not too large.
According to an embodiment of the present disclosure, when the input control voltage V1 is low (e.g., about 0.8V or less), the N-type tube N1 serving as a control switch is turned off, and the current of the P-type tube P1 is a result of dividing the input control voltage V1 by the sum of the resistor R1 and the resistor R2. Wherein the resistances R1 and R2 are large resistances of about 2K-10 Kohm. This current is mirrored through P-type pipe P2 and added to supplemental current I1, multiplied by resistor R4 to obtain output control voltage V2, expressed as equation (1) below:
according to an embodiment of the present disclosure, when the input control voltage V1 continues to increase (e.g., about 0.8-1.0V), the N-type tube N1 serving as the control switch is gradually turned on, and the on-resistance R of the N-type tube N1 N1 Gradually decreasing. The output control voltage V2 at this time is represented by the following equation (2):
according to an embodiment of the present disclosure, when the input control voltage V1 continues to increase to 1V or more, the on-resistance R of the N-type tube N1 serving as a control switch N1 The resistance after the two are connected in parallel is negligible if the magnitude of the resistance R1 is small compared with the magnitude of the resistance R1. Therefore, the expression of the above-described output control voltage V2 becomes (3):
on-resistance R due to N1 of N-type tube N1 The magnitude of (2) is continuously varied, so that the output control voltage V2 does not occur abrupt in the course of changing according to the formulas (1) to (3), thereby preventing abrupt power changes.
Fig. 2 shows a schematic diagram of a power control circuit for slowing down a power versus control voltage curve at a medium and small power according to an embodiment of the invention.
In fig. 2, the filter network circuit includes a low-pass filter configured with a resistor R3 and a capacitor C1. In this case, the gate of the N-type tube N1 is connected to one end of the resistor R3 and the capacitor C1, and the other end of the resistor R3 is connected to the input control voltage V1, and the other end of the capacitor C1 is connected to the ground. In addition, descriptions similar to those in fig. 1 are omitted.
According to an embodiment of the present disclosure, the resistor R3 and the capacitor C1 constitute a low-pass filter of the input control voltage V1 for filtering out fluctuations of the input control voltage, thereby preventing an influence on the accuracy of the output control voltage V2.
Fig. 3 is a schematic diagram showing a power control circuit and a power amplifier for slowing down a power variation curve with a control voltage in a medium-small power according to an embodiment of the present invention, and fig. 4 is a curve of an output power variation with a control voltage according to an embodiment of the present disclosure.
Referring to fig. 3, an input control voltage V1 is processed into an output control voltage V2 through a power control circuit. The output control voltage V2 is input to the power amplifier for controlling the magnitude of the output power. Referring to fig. 4, in which the horizontal axis represents the input control voltage V1 and the vertical axis represents the output power Pout of the power amplifier. Curve 1 represents the variation of output power with input control voltage V1 prior to application of the present disclosure, and it can be seen that at medium and small powers, the curve is very steep. Curve 2 shows the variation of output power with input control voltage V1 after application of the present disclosure, it can be seen that at medium and small powers the curve is significantly slowed down, but the power at maximum power remains unchanged.
The text and drawings are provided as examples only to aid in the understanding of the present disclosure. They should not be construed as limiting the scope of the disclosure in any way. While certain embodiments and examples have been provided, it will be apparent to those of ordinary skill in the art from this disclosure that variations can be made to the embodiments and examples shown without departing from the scope of the disclosure.
According to an embodiment of the present invention, there is provided a power control circuit that slows down a power change at a small and medium power, i.e., the present invention modifies a control voltage so that it slows down a curve at a small and medium power stage (in a range where the voltage is relatively low). Meanwhile, in order to ensure that the modification does not affect the maximum value of the control voltage, namely the maximum value of the output power of the power amplifier, the embodiment of the invention ensures that the output of the modified control voltage finally reaches the original maximum value when the control voltage is high.
Although the present disclosure has been described with exemplary embodiments, various changes and modifications may be suggested to one skilled in the art. The disclosure is intended to embrace such alterations and modifications that fall within the scope of the appended claims.
Any description of the present invention should not be construed as implying that any particular element, step, or function is a necessary element to be included in the scope of the claims. The scope of patented subject matter is defined only by the claims.
Claims (10)
1. A power control circuit, comprising:
a feedback amplifier receiving the input control voltage V1 and a feedback voltage from an output thereof, and configured to be connected to the mirror current circuit;
a control switch circuit that receives an input control voltage V1 and is connected to the mirror current circuit to provide a circuit whose resistance varies with the input control voltage V1;
an image current circuit connected to the output terminal of the feedback amplifier, the control switch circuit, and the output voltage generation circuit to provide an image current according to the input control voltage V1 and the resistance of the control switch circuit;
an output voltage generation circuit connected to the mirror current circuit to provide a slowed output control voltage according to the received mirror current,
wherein the feedback amplifier comprises an operational amplifier circuit, and
wherein the operational amplifier is configured such that an-input terminal of the operational amplifier is connected to an input control voltage V1, and such that a +input terminal of the operational amplifier is connected to an output terminal of the operational amplifier through the mirror current circuit.
2. The power control circuit of claim 1, wherein the control switch circuit comprises: an N-type tube N1 serving as a switch, a resistor R1, and a resistor R2, wherein,
the grid electrode of the N-type tube N1 is connected to an input control voltage V1, the on and off of the N-type tube N1 is controlled by the input control voltage V1, the source electrode of the N-type tube N1 is connected to one end of a resistor R1, and the drain electrode of the N-type tube N1 is connected to the other end of the resistor R1 so as to be connected with a mirror current circuit;
resistor R2 is configured in series with resistor R1, with one end connected to resistor R1 and the other end grounded.
3. The power control circuit of claim 2, wherein the control switch circuit further comprises a filter network circuit configured to be connected between the gate of the N-type pipe N1 and an input control voltage V1 to filter out fluctuations in the input control voltage V1.
4. The power control circuit of claim 3, wherein the filter network circuit comprises a low pass filter, and
the low-pass filter comprises a resistor R3 and a capacitor C1, one end of the resistor R3 is connected to the input control voltage V1, the other end of the resistor R3 is connected to the capacitor C1 and connected to the grid electrode of the N-type tube N1, and one end of the capacitor C1 is connected with the resistor R3 and the other end of the capacitor C is grounded.
5. The power control circuit of claim 1, wherein the mirror current circuit comprises a P-type pipe P1 and a P-type pipe P2,
wherein sources of the P-type pipes P1 and P2 are commonly connected to a power supply voltage, gates of the P-type pipes P1 and P2 are commonly connected to an output terminal of the feedback amplifier a, and a drain of the P-type pipe P1 is connected to the control switching circuit and a drain of the P-type pipe P2 is connected to an output voltage generating circuit to output an output control voltage.
6. The power control circuit of claim 1, wherein the output voltage generation circuit comprises a resistor R4, wherein one end of the resistor R4 is connected to the mirror current circuit to output an output control voltage, and the other end thereof is grounded.
7. The power control circuit of claim 6, wherein the output voltage generation circuit further comprises a supplemental current source I1, wherein one end of the supplemental current source I1 is connected to a power supply voltage and the other end thereof is connected in parallel with a resistor R4 to reduce an input control voltage V1 for turning on the power amplifier.
8. The power control circuit of any one of claims 1-7,
wherein when the input control voltage V1 is low and the N-type tube N1 is disconnected, the output control voltage is
9. The power control circuit of any one of claims 1-7,
wherein when the input control voltage V1 increases and the N-type tube N1 is turned on, the output control voltage isWherein R is N1 Is the on-resistance of the N-type tube N1.
10. The power control circuit of any one of claims 1-7,
wherein when the input control voltage V1 gradually increases to 1V or more, the output voltage V2 is
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| CN202110970560.XA CN113589876B (en) | 2021-08-23 | 2021-08-23 | Power control circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110970560.XA CN113589876B (en) | 2021-08-23 | 2021-08-23 | Power control circuit |
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| CN113589876A CN113589876A (en) | 2021-11-02 |
| CN113589876B true CN113589876B (en) | 2023-12-15 |
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| CN113589876A (en) | 2021-11-02 |
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