Kim Yen Tran

US Patent:

62977091, Oct 2, 2001

Filed:

Jul 14, 1999

Appl. No.:

9/354356

Inventors:

Jukka-Pekka Neitiniemi - Irving TX
Kim A. Tran - Garland TX

Assignee:

Nokia Telecommunications Oy - Espoo

International Classification:

H01P 122
H03G 1102

US Classification:

333 171

Abstract:

A temperature compensated variable attenuator comprising a variable attenuator having at least one diode with temperature variations across the at least one diode producing a temperature offset signal. A bias source coupled to the variable attenuator supplies a biasing signal to the at least one diode through a temperature compensation source. The temperature compensation source is coupled between the bias source and the variable attenuator with the temperature compensation source comprising at least one diode capable of producing a temperature offset signal approximately equivalent to the temperature offset signal produced by the first at least one diode. The approximate temperature offset signal subtracted from the biasing signal produces a temperature compensated bias signal that is supplied to the variable attenuator.