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Apparatus and method for a wide-band direct-coupled transistor amplifier

  • US 4,833,423 A
  • Filed: 07/20/1987
  • Issued: 05/23/1989
  • Est. Priority Date: 07/20/1987
  • Status: Expired due to Term
First Claim
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1. A wide-band direct-coupled transistor amplifier circuit having a feedback network, said amplifier circuit comprising:

  • an input means receiving an input signal and providing intermediate signals, said input means including;

    a first pair of complementary transistors having base terminals thereof coupled together, said coupled first transistor pair base terminals having said input signal applied thereto, anda second pair of complementary transistors having emitter terminals thereof coupled together, each base terminal of said second pair of transistors coupled to an emitter terminal of an associated one of said first pair of transistors;

    an output means for providing an output signal, said output means including a third pair of complementary transistors having collector terminals thereof coupled together, said coupled third transistor pair collector terminals providing said output signal, wherein a base terminal of each of said third transistor pair is coupled to a collector terminal of an associated one of said second transistor pair; and

    a feedback means including;

    transistor means coupled between said second transistor pair base terminals,first series transistor means coupled to an emitter terminal of a first transistor of said third transistor pair and responsive to current through said first transistor of said third transistor pair,second series transistor means coupled to an emitter terminal of a second transistor of said third transistor pair and responsive to current through said second transistor of said third transistor pair,a biasing transistor,constant current source coupled to a collector terminal of said biasing transistor, wherein said biasing transistor collector terminal is coupled to a control terminal of said transistor means, a base terminal of said biasing transistor being coupled to said first and said second series transistor means, wherein a change in current through said third transistor pair causes a change in voltage of said biasing transistor collector terminal.

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