Rf peak detector circuit
AssigneeTexas Instruments Incorporated
InventorArnab DAS
Life of this patent
Estimating the term…
Abstract
An apparatus comprises a transistor pair including a first metal oxide semiconductor field effect transistor (MOSFET) coupled to a second MOSFET. The first MOSFET includes a first gate terminal and a first drain terminal. The second MOSFET comprises a second gate terminal and a second drain terminal. The first gate terminal is configured to receive a first signal. The second gate terminal is configured to receive a second signal that is phase shifted with respect to the first signal. An output node is coupled to the first drain terminal and the second drain terminal and configured to output a third signal that is proportional to a power of the first signal and the second signal.
Claims20
A system for detecting power of a signal, comprising:
- an antenna configured to send a first signal;
- an amplifier coupled to the antenna to receive the first signal and configured provide a second signal based on the first signal;
- a peak detector coupled to the amplifier, comprising:
- a transistor pair, comprising:
- a first metal oxide semiconductor field effect transistor (MOSFET) comprising a first gate terminal, a first drain terminal, and a first source terminal;
- and
- a second MOSFET coupled to the first MOSFET and comprising a second gate terminal, a second drain terminal, and a second source terminal, wherein the second drain terminal is coupled to the first drain terminal, and wherein the second source terminal is coupled to the first source terminal;
- a first input node coupled to the first gate terminal and configured to receive a first differential component of the second signal;
- a second input node coupled to the second gate terminal and configured to receive a second differential component of the second signal;
- and
- an output node coupled to the first drain terminal and the second drain terminal and configured to output a third signal that is proportional to a power of the first signal and the second signal;
- and
- an automatic gain-control (AGC) circuit coupled to the output node of the peak detector and to the amplifier, wherein the AGC circuit is configured to provide a gain control signal to the amplifier based on the third signal.
An apparatus, comprising:
- a transistor pair, comprising:
- a first metal oxide semiconductor field effect transistor (MOSFET) comprising a first gate terminal and a first drain terminal;
- and
- a second MOSFET coupled to the first MOSFET and comprising a second gate terminal and a second drain terminal;
- a first input node coupled to the first gate terminal and configured to receive a first signal of a differential pair;
- a second input node coupled to the second gate terminal and configured to receive a second signal of the differential pair;
- and
- an output node is coupled to the first drain terminal and the second drain terminal and configured to output a third signal that is proportional to a power of the first signal and the second signal.
A system, comprising:
- an antenna configured to send a first signal;
- an amplifier coupled to the antenna to receive the first signal and configured provide a second signal based on the first signal;
- a mixer coupled to the amplifier to receive the second signal and configured to provide a third signal based on the second signal;
- a filter coupled to the mixer to receive the third signal and configured to provide a fourth signal based on the third signal;
- an analog-to-digital converter (ADC) coupled to the filter and configured to provide a fifth signal based on the fourth signal;
- a peak detector coupled to the amplifier to receive the second signal and configured to provide a sixth signal based on the second signal;
- a comparator coupled to the peak detector to receive the sixth signal and configured to output a trigger signal based on a comparison of a threshold signal with the sixth signal;
- and
- an automatic gain-control (AGC) circuit coupled to the comparator and to the amplifier, wherein the AGC circuit is configured to provide a gain control signal to the amplifier based on the trigger signal.
Dependencies are inferred from the claim text.