Integrated circuit amplifier with variable gain control - uses two long-trailed pairs of transistors with base control by AGC input,申请号NL19870001220-传众专利搜索

Integrated circuit amplifier with variable gain control - uses two long-trailed pairs of transistors with base control by AGC input

申请公布号：NL8701220(A)

申请号：NL19870001220

申请日期：1987.05.22

申请公布日期：1988.12.16

申请人：

N.V. PHILIPS' GLOEILAMPENFABRIEKEN TE EINDHOVEN.

分类号：H03G1/00;H03G1/04

主分类号：H03G1/00

摘要：<p>The two input terminals (Vi1,Vi2) of the input signal (Vi') are fed to pairs (T1,T2 and T3,T4) of NPN transistors via the 'long-tailed' current source transistors (T9,T10). The collectors of the pairs of transistors are cross-coupled and fed to load resistors (Rc1,Rc2) and the amplifier output terminals (Vo1,Vo2). Additional transistors (T5,T6) are strapped across the emitters and collectors of the pairs, but the bases are supplied from an AGC input signal (VAGC). The d.c. level compensation varies with the a.c. signal levels.</p>