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US 8,344,808 B2Granted
Non-linear capacitance compensation
AssigneeJavelin Semiconductor, Inc.
InventorsAnil Samavedam, David E. Bockelman, Vishnu Srinivasan, Eric Kimball
Life of this patent
Estimating the term…
Abstract
Embodiments are directed to capacitance compensation via a compensation device coupled to a gain device to compensate for a capacitance change occurring due to an input signal change, along with a controller coupled to the compensation device to receive the input signal and to control an amount of compensation based on the input signal. In some embodiments, banks may be formed of multiple compensation devices, where each of the banks has a different size and is coupled to receive a different set of bias voltages.
Claims7
A power amplifier comprising:
- a gain stage having first and second complementary amplifiers, the gain stage to receive a differential input signal and to output a differential amplified signal;
- a non-linear capacitance compensation circuit including a plurality of compensation devices, wherein each compensation device is to compensate for a change in capacitance of at least a portion of the first and second complementary amplifiers responsive to a signal swing of the differential input signal;
- and
- a controller to control an amount of the capacitance compensation provided by the non-linear capacitance compensation circuit by control of at least one of an area adjust of the non-linear capacitance compensation circuit and bias voltage provided to the non-linear capacitance compensation circuit.
1 more element
An apparatus comprising:
- a first compensation device to couple to a first gain device to compensate for a non-linear capacitance of the first gain device caused by a swing in an input signal to the first gain device, the first compensation device including a first complementary metal oxide semiconductor (CMOS) transistor having a first terminal coupled to a first bias voltage node, a second terminal coupled to a first capacitor, and a gate terminal coupled to the first capacitor at a second bias voltage node;
- and
- a second compensation device to couple to a second gain device to compensate for a non-linear capacitance of the second gain device caused by the input signal swing to the second gain device, the second compensation device including a second CMOS transistor having a first terminal coupled to the first bias voltage node, a second terminal coupled to a second capacitor, and a gate terminal coupled to the second capacitor at a third bias voltage node.
Dependencies are inferred from the claim text.