Monolithic active isolator
AssigneePacific Monolithics
InventorsAllen F. Podell, Sanjay B. Moghe, Fazal Ali
Life of this patent
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Abstract
A push-pull monolithic active isloator having a pair of MESFETs in common-gate and common-drain (source follower), parallel configuration. These two FETs are the same size and a diode is inserted between the gate of the source follower and the source of the common-gate FET. A D.C. blocking capacitor is included at the output. Another FET is coupled between the input and ground and responsive to a control signal to vary the current in a biasing resistor between the drain and gate of the source follower.
Claims12
An active isolator circuit for electrically isolating an input terminal from an output terminal comprising:
- a common-gate transistor means having a gate means coupled to ground, a source means coupled to the input terminal, and a drain means coupled to the output terminal;
- and
- a source-follower transistor means having a gate means coupled to said source means of said common-gate transistor means, a drain means coupled to a voltage source, and a source means coupled to said drain means of said common-gate transistor means.
An active isolator circuit for electrically isolating an input terminal from an output terminal comprising:
- a common-gate MESFET having a gate coupled to ground, a source coupled to the input terminal, and a drain coupled to the output terminal;
- a source-follower MESFET having a gate coupled to said source of said common-gate MESFET, a drain coupled to a voltage source, and a source coupled to said drain of said common-gate MESFET;
- and
- a diode posed between said source of said common-gate MESFET and said gate of said source-follower MESFET.
Dependencies are inferred from the claim text.