Patent Number: 6,297,709

Title: Temperature compensated variable attenuator

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.

Inventors: Wey; Chia-Sam (Arlington, TX), Neitiniemi; Jukka-Pekka (Irving, TX), Tran; Kim A. (Garland, TX)

Assignee: Nokia Telecommunications Oy

International Classification: H03H 11/02 (20060101); H03G 1/00 (20060101); H03H 11/24 (20060101); H03G 1/04 (20060101); H01P 001/22 (); H03G 011/02 ()

Expiration Date: 10/02/2018