ApplicationNo. 06/066239 filed on 08/13/1979
US Classes:330/86, Variable impedance in feedback path varied by separate control path330/254, Having gain control means330/282, Having feedback means acting as variable impedance330/284Having attenuation means in signal transmission path
ExaminersPrimary: Smith, Alfred E.
Assistant: Grigsby, T. N.
Attorney, Agent or Firm
International ClassH03G 3/00 (20060101)
Foreign Application Priority Data1978-08-11 JP
AbstractA circuit for varying the gain of an amplifier circuit linearly in decibel by the use of a digital code signal varying linearly, wherein a resistance network to be connected between an amplifier having a fixed gain and an input or output portion for the amplification is connected and the gain of the amplifier as well as the values of resistance elements constituting the resistance network is set so that the transfer function of the amplifier circuit may become: ##EQU1## .