FEEDFORWARD CONTROLLED ENVELOPE MODULATOR AND FEEDFORWARD CONTROL CIRCUIT THEREOF
First Claim
1. A feedforward controlled envelope modulator, comprising:
- a linear amplifier circuit, for amplifying an input voltage signal, so as to output an output voltage signal to a load node;
a switching amplifier, for receiving a comparison signal, and outputting a switching current to the load node according to the comparison signal; and
a feedforward control circuit, comprising;
a duplicate linear amplifier circuit, for amplifying the input voltage signal, so as to output a reference voltage signal, wherein an amplifying gain of the duplicate linear amplifier circuit is identical to an amplifying gain of the linear amplifier circuit; and
a hysteresis comparator, for comparing the output voltage signal and the reference voltage signal, so as to output the comparison signal.
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Abstract
The present disclosure illustrates a feedforward controlled envelope modulator and a feedforward control circuit thereof. The feedforward controlled envelope modulator comprises a linear amplifier circuit, a switching amplifier, and a feedforward control circuit. The linear amplifier circuit amplifies an input voltage signal, so as to output an output voltage signal to a load node. The switching amplifier receives a comparison signal, and outputs a switching current to the load node according to the comparison signal. The feedforward control circuit comprises a duplicate linear amplifier circuit and a hysteresis comparator. The duplicate linear amplifier circuit amplifies the input voltage signal, so as to output a reference voltage signal, wherein an amplifying gain of the duplicate linear amplifier circuit is identical to an amplifying gain of the linear amplifier circuit. The hysteresis comparator compares the output voltage signal and the reference voltage signal, so as to output the comparison signal.
9 Citations
25 Claims
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1. A feedforward controlled envelope modulator, comprising:
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a linear amplifier circuit, for amplifying an input voltage signal, so as to output an output voltage signal to a load node; a switching amplifier, for receiving a comparison signal, and outputting a switching current to the load node according to the comparison signal; and a feedforward control circuit, comprising; a duplicate linear amplifier circuit, for amplifying the input voltage signal, so as to output a reference voltage signal, wherein an amplifying gain of the duplicate linear amplifier circuit is identical to an amplifying gain of the linear amplifier circuit; and a hysteresis comparator, for comparing the output voltage signal and the reference voltage signal, so as to output the comparison signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A feedforward control circuit, used in a feedforward controlled envelope modulator, comprising:
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a duplicate linear amplifier circuit, for amplifying an input voltage signal, so as to output a reference voltage signal, wherein an amplifying gain of the duplicate linear amplifier circuit is identical to an amplifying gain of a linear amplifier circuit of the feedforward controlled envelope modulator, and the linear amplifier circuit amplifies an input voltage signal, so as to output an output voltage signal to a load node of the feedforward controlled envelope modulator; and a hysteresis comparator, for comparing the output voltage signal and the reference voltage signal, so as to output the comparison signal to a switching amplifier of the feedforward controlled envelope modulator, wherein the a switching amplifier receives a comparison signal, and outputs a switching current to the load node according to the comparison signal. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification