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US 11,994,548 B2Granted
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 transistor comprising a first control terminal, a first current terminal, and a second current terminal, the first control terminal configured to receive a first differential component of the second signal;
- and
- a second transistor comprising a second control terminal, a third current terminal, and a fourth current terminal, wherein the third current terminal is coupled to the first current terminal to form an output node of the peak detector, the output node configured to output a third signal, the fourth current terminal is coupled to the second current terminal, and the second control terminal is configured to receive a second differential component of the second signal;
- and
- a parallel resistive-capacitive circuit having a first end coupled to the first current terminal and the third current terminal and having a second end configured to be coupled to a voltage supply;
- 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.
8 more elements
An apparatus, comprising:
- a transistor pair, comprising:
- a first transistor comprising a first control terminal and a first current terminal, the first control terminal configured to receive a first component of a differential signal;
- and
- a second transistor comprising a second control terminal and a second current terminal coupled to the first current terminal, wherein teh second control terminal is configured to receive a second component of the differential signal, and the second current terminal is coupled to teh first current terminal to form an output node that is configured to output a third signal;
- and
- a parallel resistive-capacitive circuit having a first end coupled to teh first current terminal and teh second current terminal and having a second end configured to be coupled to a voltage supply.
3 more elements
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, the second signal being a differential 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, wherein teh peak detector includes a transistor pair having respective current terminals coupled together, each transistor of teh transistor pair having a control terminal configured to receive a respective component of teh differential signal, the peak detector further including a parallel resistive-capacitive circuit having a first end coupled to the respective current terminals of the transistor pair and a second end configured to be coupled to a voltage supply;
- 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.
6 more elements
Dependencies are inferred from the claim text.