1. A voltage tunable CMOS differential active resistor and its application.
- Author
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Maundy, Brent J., Elwakil, Ahmed S., and Zito, Domenico
- Subjects
ELECTRIC resistors ,COMPLEMENTARY metal oxide semiconductors ,ELECTRIC potential ,TRANSISTORS ,ELECTRIC circuit design & construction - Abstract
Summary: We propose a novel CMOS differential voltage‐controlled equivalent active resistor based on a modified common‐source cross‐coupled pair. The equivalent resistance exhibited by the circuit can be tuned to be either positive or negative through the tail current, which is controlled by a bias voltage. The complete cell comprises four transistors, two resistors in addition to the bias voltage, and tail current source. Application to the design of oscillators is demonstrated by theoretical analysis, circuit simulations, and verified experimentally through measurements on prototypes implemented using discrete transistors. In this work, we propose a novel tunable negative or positive differential resistance implemented using four transistors, which offers an advantage over the conventional cross‐coupled differential pair. The advantage being that the equivalent resistance exhibited by the circuit can be tuned to be either negative or positive through a tail current as well as via a bias voltage. Its linearity and range of operation are examined, and applications to oscillators are demonstrated through simulations and experiments. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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