International Business Machines Corporation

Christian J Goetschel

Raymond Alan Richetta

Timothy Joseph Schmerbeck

Rick Allen Philpott

Robert Andrew Kertis

David Peter Swart

Donald Joseph Schulte

Robert A Greene

Richard Leo Galbraith

Anthony Richard Bonaccio

John E Gersbach

Sharon Lynne Von Bruns

A method and apparatus are provided for translating small voltage continuous signals into large full supply signals to generate a clock signal. At least one oscillator input signal is applied to a first amplifier stage for generating an amplified voltage output signal. A first inverter is coupled to the first amplifier stage. A second inverter is coupled to the first inverter. An AC coupling capacitor couples the amplified voltage output signal to the first inverter input, and a feedback resistor is connected between the output and input of the first inverter.

Method and apparatus for generating a clock signal from a continuous

An integrated biquadratic, continuous-time filter section includes a plurality of operational transconductance amplifiers (OTAs). Simutaneously changing a transconductance (GM) of each of the OTAs is provided by adjusting a differential voltage applied to a plurality of differential transistor pairs of each OTA. Each of the OTAs include a plurality of current sources and a common mode feedback circuit for controlling a common mode output voltage level. Changing the transconductance of the OTA is independent of the common mode voltage level control.

Operational transconductance amplifier with independent transconductance

By providing data to a selection switch via a multiplexor so it can be programmed to supply either a current programmably controlled by a shift register or a current fixed by a fused resistor. Selected signals coupled to the multiplexor control the selection of either the resistor or the shift register thus, providing an improved current selection device which is capable of automatically selecting and programming the current supplied to circuits such as digital to analog converters.

Programmable digital to analog converter

A method and apparatus are provided for adaptive chip trim adjustment for an integrated circuit. A plurality of switching devices have an unswitched state and a switched state. The unswitched state corresponds to one binary value, and the switched state corresponds to another binary value. A first trim word is provided by sensing the switching devices. The switching devices are temporarily bypassed, and an override bit pattern is supplied to simulate any desired pattern of the switching device states. The override bit pattern is used for simulating a switched or unswitched state for each of the plurality of switching devices.

Method and apparatus for adaptive chip trim adjustment

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Rochester, MN, United States of America

Christian J Goetschel