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US 12,756,414 B2Granted
Wide-band peak detection for an RF receiver
AssigneeSilicon Laboratories Inc.
InventorAbdulkerim L. Coban
Life of this patent
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Abstract
A wideband power detector (peak or RMS) is placed in a base-band portion of a receiver chain implemented with a current mode RF front end. A differential transimpedance amplifier (TIA) includes a current sense circuit that replicates the input currents to the TIA as current sense output voltages without the current sense output voltages being affected by the filter characteristics of the TIA.
Claims21
A method comprising:
- receiving a differential input current at a transimpedance amplifier (TIA) with input current sensing in a base-band portion of a receiver chain of a radio frequency (RF) receiver;
- and
- generating a current sense differential output voltage on a first output node and a second output node of the TIA, the current sense differential output voltage corresponding to the differential input current to the TIA;
- and
- compensating for load current from the TIA while sensing the differential input current to cause the current sense differential output voltage to be independent of the load current and thereby independent of filter characteristics of the TIA.
2 more elements
A radio frequency (RF) receiver comprising:
- a differential transimpedance amplifier (TIA) with input current sensing, the TIA including,
- a first branch including a first amplifier circuit coupled to receive a first input current and supply a first output voltage on a first output node;
- a second branch including a second amplifier circuit coupled to receive a second input current and supply a second output voltage on a second output node;
- a current sensing circuit including a first current sense amplifier circuit and a second current sense amplifier circuit coupled respectively to the first input current and the second input current, the current sensing circuit to supply a third output voltage on a third output node indicative of the first input current and a fourth output voltage on a fourth output node indicative of the second input current;
- and
- wherein the current sensing circuit includes a load current compensation circuit.
3 more elements
A radio frequency (RF) receiver comprising:
- a first amplifier circuit configured to generate a first output voltage on a first output node, the first output voltage corresponding to a first input current to the first amplifier circuit, and the first output voltage being dependent in part on filter characteristics of the first amplifier circuit;
- a second amplifier circuit to generate a second output voltage on a second output node, the second output voltage corresponding to a second input current to the second amplifier circuit and the second output voltage dependent in part on filter characteristics of the second amplifier circuit;
- a current sense circuit including,
- a first current sense amplifier to generate a first current sense voltage on a first current sense output node, the first current sense voltage being indicative of the first input current and being independent of the filter characteristics of the first amplifier circuit;
- a second current sense amplifier to generate a second current sense voltage on a second current sense output node, the second current sense voltage being indicative of the second input current and being independent of the filter characteristics of the second amplifier circuit;
- and
- a load current compensation circuit that includes a first compensation resistor coupled between the first output node and the second current sense output node and a second compensation resistor coupled between the second output node and the first current sense output node;
- and
- wherein the first amplifier circuit and the second amplifier circuit have a transconductance of gm and the first current sense amplifier and the second current sense amplifier have a transconductance of gm/N, where N is greater than 1.
6 more elements
Dependencies are inferred from the claim text.