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US 11,502,658 B2Granted
Amplifier with adjustable high-frequency gain using varactor diodes
AssigneeKandou Labs, S.A.
InventorsSuhas Rattan, Kiarash Gharibdoust
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Abstract
The detection matrix for an Orthogonal Differential Vector Signaling code is typically embodied as a transistor circuit with multiple active signal inputs. An alternative detection matrix approach uses passive resistor networks to sum at least some of the input terms before active detection.
Claims20
A method comprising:
- receiving a differential input signal at a plurality of differential pairs, and responsively generating an amplified output signal on a pair of output nodes, each differential pair having a corresponding tunable source impedance;
- generating an analog voltage to set fine and coarse settings of a direct-current (DC) gain applied to the differential input signal, wherein the coarse setting of the DC gain is associated with a value of the analog voltage;
- providing the analog voltage to the tunable source impedance of a selectable number of differential pairs according to a thermometer code to configure the selectable number of differential pairs in a wideband mode of operation, wherein the fine setting of the DC gain is determined by the selectable number of differential pairs receiving the analog voltage;
- and
- setting the corresponding tunable source impedances of all remaining differential pairs in an open-circuit configuration to configure the remaining differential pairs in a peaking mode of operation.
2 more elements
An apparatus comprising:
- a plurality of differential pairs connected in parallel to a pair of output nodes, the plurality of differential pairs configured to receive a differential input signal and to responsively generate an amplified output signal on the pair of output nodes;
- each differential pair of the plurality of differential pairs having a corresponding tunable source impedance for setting DC gain relative to a high-frequency peak amplification of the amplified output signal;
- and
- a control signal generator having a plurality of output taps connected to corresponding tunable source impedances, the control signal generator configured generate an analog voltage on a selectable number of the plurality of output taps in accordance with a thermometer code, wherein the selectable number of output taps sets a fine setting of the DC gain and wherein a value of the analog voltage sets a coarse setting of the DC gain.
1 more element
Dependencies are inferred from the claim text.