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US 2019/0379340 A1Published application
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
An apparatus comprising:
- a differential pair configured to receive a differential input signal and to responsively generate an amplified output signal on a pair of output nodes;
- a tunable capacitance configured to adjust a high frequency amplification applied to the differential input signal, the tunable capacitance comprising:
- a pair of series-connected varactor diodes connected to the differential pair configured to receive a control signal at a common node to adjust a frequency of the high frequency amplification;
- and
- a fixed capacitance connected in parallel to the pair of series-connected varactors, the fixed capacitor having a capacitance larger than a capacitance of the series-connected varactors configured to offset changes in charge density of channels in the series-connected varactor diodes.
2 more elements
Dependencies are inferred from the claim text.