Phase splitting amplifier

Claim 2

An electrical circuit comprising: first and second transistors of like conductivity type both having base, emitter and collector electrodes; a first diode connected between the base and emitter electrodes of said second transistor and poled for current conduction in response to the same polarity voltage producing base-emitter conduction in said second transistor, means connecting the first diode in series with the emittercollector current path of said first transistor and poled for current conduction in the same direction as the emittercollector path of said first transistor; biasing means coupled to the base electrode of said first transistor for establishing a predetermined collector-toemitter electrode current in said first transistor; the junction area of said first diode relative to the base emitter junction area of said second transistor being related so that the collector current of said second transistor bears a predetermined relationship to the current in the first diode and a predetermined relationship to the current in the first diode and a predetermined relationship to the collector current of said first transistor; and means providing a pair of signal input terminals connected respectively to the base and emitter electrodes of said second transistor.

Claim 3

An electrical circuit as defined in claim 1 including: A power output circuit comprising a pair of transistors series connected to drive a load from their common connection; and means direct current coupling the collector electrodes of said first and second transistors to the pair of transistors for providing push-pull drive and operating bias to said stages.

Claim 4

An electrical circuit as defined in claim 2 wherein said power output circuit comprising a pair of transistors includes a pair of diodes connected to said pair of transistors to form diode-transistor composites each having substantially equal predetermined current gains.

Claim 5

An electrical circuit as defined in claim 1 wherein said biasing means includes a pair of series connected diodes connected to the base electrode of said first transistor and to the emitter electrode of said second transistor, and a voltage dropping impedance means connected between said base electrode of said first transistor and a terminal of an operating potential supply source.

Claim 6

An electrical circuit as defined in claim 4 wherein the junction area of said pair of series connected diodes is large relative to the base emitter-junction area of said first transistor.

Claim 7

An electrical circuit as defined in claim 1 wherein the junction area of said first diode is related to the base emitter junction area of said second transistor such that quiescent current in said first transistor is substantially equal to the quiescent current in said second transistor.

Claim 8

An electrical circuit as defined in claim 6 wherein the junction of said first diode and the base emitter junction area of said second transistor are substantially equal to the base emitter junction area of said first transistor as constructed on a single semiconductor wafer.

Claim 9

An electrical circuit as defined in claim 1 wherein said biasing means comprises second, third and fourth diodes and a voltage dropping impedance means between the terminals of an operating potential supply source; a third and fourth transistors both having base, emitter and collector electrodes; means connecting the emitter-to-collector current paths of said third and fourth transistors in series and in parallel with the series combination of said voltage dropping impedance meaNs and said second, third and fourth diodes; means connecting the base emitter path of said third transistor in parallel with said fourth diode, means connecting the base emitter path of said fourth transistor in parallel with said second, third, and fourth diodes; and means connecting the emitter electrode of said fourth transistor to the base electrode of said first transistor.

Claim 10

A push-pull amplifier comprising a pair of power output stages each including a diode transistor composite; means providing a pair of output terminals for connection to a load, means connecting said pair of power output stages to drive said load in push-pull relation; a driver amplifier stage for each of said power output stages, said driver stages being direct current coupled to said power output stages; a phase splitter having an input terminal for connection to a source of signals to be amplified and a first and second output terminal direct current coupled to respective ones of said driver amplifiers to apply to said driver amplifiers antiphase replicas of signals applied to said input terminal; said phase splitter circuit comprising; first and second transistors both having base, emitter and collector electrodes, a first diode connected between the base and emitter electrodes of said second transistor; means connecting the base electrode of said second transistor to the emitter electrode of said first transistor; biasing means including at least a second diode providing a constant current bias source connected to the base electrode of said first transistor; means providing a pair of signal input terminals connected respectively to opposite terminals of said first diode; and means direct current coupling the collector electrodes of said first and second transistors to the first and second output terminals.

Claim 11

A push-pull amplifier comprising a pair of power output stages each including a diode transistor composite; means providing a pair of output terminals for connection to a load, means connecting said pair of power output stages to drive said load in push-pull relation; a driver amplifier stage for each of said power output stages, said driver stages being direct current coupled to said power output stages; a phase splitter having an input terminal for connection to a source of signals to be amplified and a first and second output terminal direct current coupled to respective ones of said driver amplifiers to apply to said driver amplifiers antiphase replicas of signals applied to said input terminal; said phase splitter circuit comprising; first and second transistors both having base, emitter and collector electrodes, a first diode connected between the base and emitter electrodes of said second transistor; means connecting the base electrode of said second transistor to the emitter electrode of said first transistor; biasing means including at least a second diode providing a constant current bias source connected to the base electrode of said first transistor; means providing a pair of signal input terminals connected respectively to opposite terminals of said first diode; and means direct current coupling the collector electrodes of said first and second transistors to the first and second output terminals.

Claim 12

An electrical signal translating circuit comprising: first and second transistors both having base, emitter and collector electrodes. means including a first diode connected in series with the emitter-to-collector current path of said first transistor for connecting said first transistor in a common base configuration, means connecting said second transistor in a common emitter configuration, input circuit means coupled in common to the emitter electrode of said first transistor and to the base electrode of said first transistor whereby said diode is connected between the base and emitter electrodes of said second transistor.

Claim 13

An electrical signal translating circuit comprising: first and second transistors both having base, emitter and collector electrodes. means including a first diode connected in series with the emitter-to-collector current path of said first transistor for connecting said first transistor in a common base configuration, means connecting said second transistor in a common emitter configuration, input circuit means coupled in common to the emitter electrode of said first transistor and to the base electrode of said first transistor whereby said diode is connected between the base and emitter electrodes of said second transistor.