Patent Number: 6,310,508

Title: High frequency switch

Abstract: A high-frequency switch for blocking or transmitting a high frequency input signal. The switch includes a common-base transistor having an emitter, base, and collector, the emitter being connected to an input node and the base being connected to a power rail that is preferably ground. The input node is coupled to the input signal. The present invention utilizes a shunt having a switching element with closed and open states to route the input signal either to the collector of the common-base transistor or to the power rail. The switching element connects the input node to the power rail in the closed state and isolates the input node from the power rail when the switching element is in the open state. The open and closed states are selected by the application of a control signal to the switching element. A bias circuit sets the input node to be at a first bias potential when the switching element is in the open state and a second bias potential when the switching element is in the closed state. The first bias potential causes the common-base transistor to be in a conducting state, and the second bias potential causing the common-base transistor to be in a non-conducting state. The switching element may be constructed from a wide variety of circuit elements including a diode, transistor, or mechanical switch.

Inventors: Westerman; Stephen J. (Santa Rosa, CA)

Assignee: Agilent Technologies, Inc.

International Classification: H03K 17/04 (20060101); H03K 17/74 (20060101); H03K 17/51 (20060101); H03K 17/041 (20060101); H03K 017/04 ()

Expiration Date: 10/30/2018