High frequency signal power detector
First Claim
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1. A signal power detector comprises:
- an input coupling circuit operably coupled to receive a signal and to convert the signal into a first input and a rectifying input;
a rectifying operational amplifier including;
first input transistor operably coupled to receive the first input;
second input transistor;
rectifying transistor operably coupled to receive the rectifying input;
current source operably coupled to provide a reference current to the first input transistor, second input transistor, and the rectifying transistor;
first active input load transistor operably coupled to provide a first active load for the first input transistor and the rectifying transistor;
second active input load transistor operably coupled to provide a second active load for the second transistor;
active output load transistor operably coupled to mirror the reference current; and
output transconductance stage operably coupled to the active load transistor and to the first input transistor and the rectifying transistor, wherein the output transconductance stage provides a rectified output representing a peak value of the signal; and
a charge pump operably coupled to convert the rectified output into a corresponding current, wherein the corresponding current represents power of the signal.
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Abstract
A signal power detector includes an input coupling circuit a rectifying operational amplifier, and a charge pump. The input coupling circuit is operably coupled to receive a signal and to convert the signal into a first input and a rectifying input. The rectifying operational amplifier is operably coupled to receive the first input and the rectifying input and to produce therefrom a rectified output signal that represents a peak of the received signal. The charge pump converts the rectified output into a corresponding current, wherein the corresponding current represents power of the signal.
17 Citations
18 Claims
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1. A signal power detector comprises:
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an input coupling circuit operably coupled to receive a signal and to convert the signal into a first input and a rectifying input; a rectifying operational amplifier including; first input transistor operably coupled to receive the first input; second input transistor; rectifying transistor operably coupled to receive the rectifying input; current source operably coupled to provide a reference current to the first input transistor, second input transistor, and the rectifying transistor; first active input load transistor operably coupled to provide a first active load for the first input transistor and the rectifying transistor; second active input load transistor operably coupled to provide a second active load for the second transistor; active output load transistor operably coupled to mirror the reference current; and output transconductance stage operably coupled to the active load transistor and to the first input transistor and the rectifying transistor, wherein the output transconductance stage provides a rectified output representing a peak value of the signal; and a charge pump operably coupled to convert the rectified output into a corresponding current, wherein the corresponding current represents power of the signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A radio frequency integrated circuit comprises:
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a receiver section operably coupled to convert inbound radio frequency signals into inbound intermediate frequency signals; transmitter section operably coupled to convert outbound intermediate frequency signals into outbound radio frequency signals; and transmit/receive switch operably coupled to connect either the receiver section or the transmitter section to an antenna, wherein the transmitter section includes; mixing module operably coupled to convert the outbound low intermediate frequency signal into a radio frequency signal; power amplifier operably coupled to amplify the radio frequency signal to produce an amplified radio frequency signal; bandpass filter operably coupled to filter the amplified radio frequency signal to produce the outbound radio frequency signal; and transmit signal strength indication module operably coupled to monitor transmit power of the power amplifier, the bandpass filter, or the transmit/receive switch, wherein the transmit signal strength indication module includes; an input coupling circuit operably coupled to receive the amplified radio frequency signal, the outbound radio frequency signal, or a transmit radio frequency signal as an input signal and to convert the input signal into a first input and a rectifying input; a rectifying operational amplifier including; first input transistor operably coupled to receive the first input; second input transistor; rectifying transistor operably coupled to receive the rectifying input; current source operably coupled to provide a reference current to the first input transistor second input transistor, and the rectifying transistor; first active input load transistor operably coupled to provide a first active load for the first input transistor and the rectifying transistor; second active input load transistor operably coupled to provide a second active load for the second transistor; active output load transistor operably coupled to mirror the reference current; and output transconductance stage operably coupled to the active load transistor and to the first input transistor and the rectifying transistor, wherein the output transconductance stage provides a rectified output representing a peak value of the signal; and a charge pump operably coupled to convert the rectified output into a corresponding current, wherein the corresponding current represents power of the input signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification