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US 4,358,739 AGranted
Wide-band direct-current coupled transistor amplifier
OwnerDavid A. Nelsoninventor
Life of this patent
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Abstract
A wide-band direct-current coupled transistor amplifier is provided which exhibits uniform gain in a frequency range from direct-current to greater than 100 MHz, and which exhibits other desirable features.
Claims7
A wide-band direct-current coupled amplifier comprising:
- a high-frequency negative-feedback symmetrical amplifier including a first pair of transistors (Q1A, Q1B) and a second pair of transistors (Q2A, Q2B), each having emitter, collector and base electrodes, and further including series-shunt and shunt-series negative feedback circuitry interconnecting the electrodes of said transistors;
- and a high-gain low-frequency amplifier (A1) connected to two of the electrodes of the transistors of the first pair (Q1A, Q1B) to increase the gain of the transistors of the first pair at low frequencies so that the feedback circuitry maintains the voltage between two of the electrodes of the second pair (Q2A, Q2B) constant.
Dependencies are inferred from the claim text.