Patent ID: 6297709
Filing Date: 2001-10-02
Classification: H03G,H03H

Abstract:
A temperature compensated variable attenuator comprising:a variable attenuator circuit having a control input and a first at least one diode, wherein temperature variations in said first at least one diode produce a first offset signal;a bias source having an output, said bias source for supplying a first biasing signal at said output; anda compensation source comprising an input and an output, said input of said compensation source coupled to said output of said biasing source and said output of said compensation source coupled to said control input of said variable attenuator, said compensation source further comprising a second at least one diode that produces a second offset signal approximately equivalent to said first offset signal produced by said first at least one diode, wherein said second offset signal compensates said first biasing signal for the effects of said first offset signal to produce a second biasing signal at the output of said compensation source, wherein said second biasing signal is input to said control input of said variable attenuator.