公开(公告)号：US3806832A

公开(公告)日：1974-04-23

申请号：US31747472

申请日：1972-12-21

Applicant: GTE AUTOMATIC ELECTRIC LAB INC

Inventor： CHANNING D ,  ESTERS B

IPC: H03B1/00 ,  H03B5/20 ,  H03B25/00

CPC classification number: H03B5/20 ,  H03B25/00 ,  H03B2201/01

Abstract: An improved R.C. oscillator comprises an operational amplifier which is provided with a controlled positive feedback network such that it will oscillate at a frequency determined by a frequency dependent impedance circuit. Two such oscillators may be combined to form a two-out-of-eight frequency oscillator for a telephone touch calling unit.

Abstract translation: 改进的R.C. 振荡器包括运算放大器，该运算放大器设置有受控正反馈网络，使得其将以由频率相关阻抗电路确定的频率振荡。 两个这样的振荡器可以组合以形成用于电话触摸呼叫单元的八分之二的频率振荡器。