EER modulator with power amplifier having feedback loop providing soft output impedance
First Claim
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1. An EER amplifier for amplifying a signal, comprising:
- (I) a divider for dividing said signal into a phase signal and an envelope signal;
(II) a first RF amplifier for amplifying said signal, said first amplifier having a bias supply input;
(III) an EER modulator having input receiving said envelope signal and an output coupled to said bias supply input of said first RE amplifier, said EER modulator comprising;
(A) a high frequency power operational amplifier for amplifying a high frequency portion of said envelope signal, and having an output coupled to said output of said EER modulator;
(B) a high efficiency power amplifier for amplifying a remaining portion of said envelope signal, said power amplifier having;
(1) a current control input,(2) a current monitoring output,(3) a power output coupled to said output of said EER modulator;
(C) a feedback control loop comprising;
(1) a current-to-voltage conversion amplifier having;
(a) an input coupled to said current monitoring output of said high efficiency power amplifier and (b) an output,(2) an input buffer amplifier having;
(a) an input coupled to receive said envelope signal and (b) an output;
(3) a summing amplifier having;
(a) an input coupled to the outputs of;
(a) said current-to-voltage conversion amplifier and (b) said input buffer amplifier, and(b) an output coupled to said current control input of said high efficiency power amplifier.
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Abstract
An EER amplifier for amplifying an RF signal includes:
- (II) a first RF amplifier for amplifying the phase portion of the signal;
- (III) an EER modulator for amplifying the envelope or baseband portion of the signal, including:
- A) a high frequency operational amplifier;
- B) a power amplifier;
- C) a feedback control loop including:
- (1) a current-to-voltage conversion amplifier having an input coupled to a current monitoring output of the power amplifier and an output,
- (2) an input buffer amplifier having an input coupled to receive the envelope signal and an output;
- (3) a summing amplifier having:
- (a) an input coupled to the outputs of: (a) the current-to-voltage conversion amplifier and (b) the input buffer amplifier, and
- (b) an output coupled to the current control input of the power amplifier.
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Citations
18 Claims
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1. An EER amplifier for amplifying a signal, comprising:
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(I) a divider for dividing said signal into a phase signal and an envelope signal; (II) a first RF amplifier for amplifying said signal, said first amplifier having a bias supply input; (III) an EER modulator having input receiving said envelope signal and an output coupled to said bias supply input of said first RE amplifier, said EER modulator comprising; (A) a high frequency power operational amplifier for amplifying a high frequency portion of said envelope signal, and having an output coupled to said output of said EER modulator; (B) a high efficiency power amplifier for amplifying a remaining portion of said envelope signal, said power amplifier having; (1) a current control input, (2) a current monitoring output, (3) a power output coupled to said output of said EER modulator; (C) a feedback control loop comprising; (1) a current-to-voltage conversion amplifier having;
(a) an input coupled to said current monitoring output of said high efficiency power amplifier and (b) an output,(2) an input buffer amplifier having;
(a) an input coupled to receive said envelope signal and (b) an output;(3) a summing amplifier having; (a) an input coupled to the outputs of;
(a) said current-to-voltage conversion amplifier and (b) said input buffer amplifier, and(b) an output coupled to said current control input of said high efficiency power amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An amplifier comprising:
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a divider circuit for dividing an incoming signal into a low frequency amplitude modulation envelope signal and a phase portion; a first RF amplifier for amplifying said phase portion, said first RF amplifier having a bias supply input; a modulator connected to receive said envelope signal for furnishing a modulated bias supply to said bias supply input of said first RF amplifier, said modulator comprising; a high frequency operational amplifier for amplifying a higher frequency portion of said envelope signal and a power amplifier for amplifying a lower frequency portion of said envelope signal, said power amplifier having an output current control input and an output current monitoring port; a feedback control loop having first and second inputs and a control output connected to said output current control input of said power amplifier, said first and second inputs connected respectively to said envelope signal and said output current monitoring port of said power amplifier, said feedback control loop comprising means for producing at said control output a signal which is a function of a difference between said envelope signal and the output current at said monitoring port of said power amplifier, whereby said feedback control loop controls the output current of said power amplifier so as to minimize said difference. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. In an envelope elimination and restoration (EER) amplifier, an EER modulator comprising:
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a high frequency amplifier having an input coupled to receive an envelope signal and an output having an output impedance; a power amplifier having a first gain, outputs of said high frequency amplifier and said power amplifier being coupled to an EER modulator output node; a feedback control loop having a first input coupled to receive said envelope signal and a second input coupled to receive an output signal of said power amplifier, said feedback control loop providing an input to said power amplifier to minimize a difference between the output of said power amplifier and said envelope signal; said feedback control loop having a first gain and said power amplifier having a second gain, said first and second gains being such that the output impedance of the combination of said power amplifier and feedback control loop does not exceed said output impedance of said high frequency amplifier by more than a factor of ten. - View Dependent Claims (17, 18)
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Specification