Comparison amplifier

Claim 2

A comparison amplifier comprising a differential amplifier having two input transistors to be supplied with two types of input signals for effecting differential amplification and a constant current source for driving said differential amplifier so as to amplify a difference voltage between said two types of input signals, said constant current source including two constant current source transistors connected to said two input transistors, respectively, and said differential amplifier including two diodes being connected together at one end of each forming a common end connected to a transistor for passing a constant current, the other ends of said two diodes being connected to said two constant current source transistors, respectively, to increase the allowable range for the difference voltage between input signals applied to said input transistors, and said differential amplifier further including two load transistors connected directly to collectors of said input transistors, respectively, for supplying collector current to said input transistors.

Claim 3

A comparison amplifier for amplifying a difference voltage between individual input signals comprising, two input terminals for receiving said individual input signals; a differential amplifier stage including a pair of input transistors connected to said input terminals, at least one transistor for making the sum of the collector currents of said input transistors constant, two load transistors connected directly to the collectors of said input transistors respectively for supplying collector currents to said input transistors, and two diodes connected between said transistors for making the sum of the collector currents constant and said pair of input transistors respectively in such a direction as to increase the allowable range for a difference voltage between input signals applied to said individual input transistors; and a constant current source stage for driving said differential amplifier stage including two constant current source transistors connected to said pair of input transistors respectively and to said diodes respectively.

Claim 4

A comparison amplifier for amplifying a difference voltage between individual input signals comprising, two input terminals for receiving said individual input signals; a differential amplifier stage including a pair of input transistors connected to said input terminals, at least one transistor for making the sum of the collector currents of said input transistors constant, two load transistors connected directly to the collectors of said input transistors respectively for supplying collector currents to said input transistors, and two diodes connected between said transistors for making the sum of the collector currents constant and said pair of input transistors respectively in such a direction as to increase the allowable range for a difference voltage between input signals applied to said individual input transistors; and a constant current source stage for driving said differential amplifier stage including two constant current source transistors connected to said pair of input transistors respectively and to said diodes respectively.

Claim 5

A comparison amplifier according to claim 2, wherein said constant current source stage includes a separate constant current source transistor for driving said transistor for making the sum of the collector current constant of said differential amplifier stage.

Claim 6

Amplifier means for amplifying a difference voltage between input signals comprising a differential amplifier stage for effecting differential amplification having two active elements for receiving two individual input signals and a constant current source stage for driving said differential amplifier stage: said differential amplifier stage including a pair of input transistors, each having a base, an emitter and a collector, adapted to receive said individual two input signals at their bases; individual load transistor means connected to the collectors of the input transistors and acting to derive an output signal; a pair of diode means and a transistor supplying a constant current to said pair of diode means and driven by a power supply in common with said load transistor means; said pair of diode means increasing an allowable range for the difference voltage between said input signals, having negative electrodes connected to the respective emitters of said pair of input transistors and positive electrodes connected to said transistor for supplying a constant current; said constant current source stage including a circuit network for constituting a constant current source consisting of transistors and resistors connected to the junctures of said pair of input transistors and said pair of diodes, respectively.

Claim 7

Amplifier means for amplifying a difference voltage between input signals comprising a differential amplifier stage for effecting differential amplification having two active elements for receiving two individual input signals and a constant current source stage for driving said differential amplifier stage: said differential amplifier stage including a pair of input transistors, each having a base, an emitter and a collector, adapted to receive said individual two input signals at their bases; individual load transistor means connected to the collectors of the input transistors and acting to derive an output signal; a pair of diode means and a transistor supplying a constant current to said pair of diode means and driven by a power supply in common with said load transistor means; said pair of diode means increasing an allowable range for the difference voltage between said input signals, having negative electrodes connected to the respective emitters of said pair of input transistors and positive electrodes connected to said transistor for supplying a constant current; said constant current source stage including a circuit network for constituting a constant current source consisting of transistors and resistors connected to the junctures of said pair of input transistors and said pair of diodes, respectively.

Claim 8

The amplifier means for amplifying a difference voltage between input signals according to claim 4, wherein said constant current source stage consists of resistors and transistors in series connection and is supplied with power from a constant current circuit connected to a power supply.