Agilent Technologies, Inc.

Sylvia Jane Budak

Joe E Marriott

Christopher J Kemp

A precision AC input voltage divider of input resistance Rand feedback resistance Ron a substrate is printed as a serpentine pattern for a thin line of resistive material. The input resistance is formed between a first and second terminal, and feedback resistance is formed between the second terminal and a third terminal. A first metallic conductor is formed on the substrate, connected to the first terminal, disposed to be adjacent to the input resistance, and having a distributed capacitive coupling to the input resistance that compensates for corresponding distributed stray capacitance from the input resistance to a circuit ground. A second metallic conductor is formed on the substrate, connected to the third terminal, disposed to be adjacent the feedback resistance, and having a distributed capacitive coupling to the feedback resistance that compensates for corresponding distributed stray capacitance from the feedback resistance to the circuit ground.

Precision thin film AC voltage divider

A precision AC input voltage divider on a substrate is printed as a serpentine pattern for a thin line of resistive material. Bothersome original 'bad' stray capacitances to a ground, particularly those to or from the middle of the serpentine, are effectively removed by coupling to their ungrounded ends additional 'good' stray capacitances that are themselves driven by the input voltage. The additional good stray capacitances are chosen to supply substantially the exact current needed by the original bad strays, so that the original resistive divider never &#x201c;sees&#x201d; the strays at all, and requires in addition only minimal conventional compensation by external parts. The additional good strays are obtained by a metallic conductor that is electrically connected to the input terminal, and runs adjacent to the serpentine resistance for part or all of its length.

A method and apparatus for reducing charge injection in a FET switch. The switch includes a switch FET and two compensating FETs coupled to an input node. Gate drive signals for the two compensating FETs are generated by a gate drive circuit dependent upon the analog input signal and gate drive signal to the switch FET.

Growing community of inventors

Windsor, CO, United States of America

Sylvia Jane Budak