Area efficient waveform evaluation and DC offset cancellation circuits
AssigneeIntel Corporation
InventorsKrishnamurthy Soumyanath, Luiz Franca-Neto
Life of this patent
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Abstract
Analog circuits for providing one or more waveform parameters, e.g., the DC offset or average, of an analog input signal. Separate biasing is not necessarily required. Some embodiments comprise field-effect-transistors (FETs) configured in various diode-connected configurations that take advantage of leakage currents through the FETs so that long resistors or large capacitors are not necessarily required. One embodiment comprises two diode-connected FETs to provide an unbiased DC offset voltage of an analog input signal.
Claims8
A circuit comprising:
- an input port;
- an output port;
- a first field-effect-transistor (FET) having a first terminal connected to the input port, a second terminal connected to the output port, and a gate connected to the input port, and having a device width and a leakage current in excess of 1 micro ampere per micron of device width;
- and
- a second FET having a first terminal connected to the output port, a gate connected to the output port, and a second terminal connected to the gate of the first FET.
A method to provide a local time-average of an input signal voltage, the method comprising:
- providing the input signal voltage to an input port;
- providing a first field-effect-transistor (FET) having a gate connected to the input port, a first terminal connected to the input port, and a second terminal connected to an output port, wherein the first FET has a device width and a leakage current in excess of 1 micro ampere per micron of device width;
- providing a second FET having a gate connected to the output port, a first terminal connected to the output port, and a second terminal connected to the gate of the first FET, wherein the second FET has a device width and a leakage current in excess of 1 micro ampere per micron of device width and
- sampling the output port to provide the local time-average of the input signal voltage.
Dependencies are inferred from the claim text.