Home | Links | Contact Us | More About Intellectual Property | Bookmark
Search patents:
Home I/O Systems Differential-amplifier

 Voltage comparator
An object of the invention is to provide a voltage comparator, which can operate efficiently with a ...


 Logarithmic transformation circuitry for use in semiconductor integrated circuit devices
It is therefore an object of the present invention to provide a new and improved logarithmic ...


 Low-voltage CMOS comparator
In general, the invention features a CMOS comparator which includes a capacitor connected in an ...


 Compact comparator
FIG. 1 shows a first embodiment of the invention. The comparator circuit 100 has first and second ...


 Synchronizing circuit for receiving an asynchronous input signal
It is an object of the present invention to provide a synchronizing circuit capable of reducing the ...


 Virtual network architecture for connectionless LAN backbone
FIG. 1 provides a conceptual overview of a network in which the present invention operates. The ...


 Fluid temperature monitoring system
The present invention is related to a temperature monitoring system, especially for monitoring ...


 Protective composite liner
The present invention satisfies the need for a simple cost-effective means to prevent spills of ...


 Method and apparatus for enhancing the operation of a data processing system
What is claimed is: 1. In a data processing sytem including: processor means for processing said ...


 Universal power supply monitor circuit
Accordingly, it is an object of the present invention to provide an improved power supply monitor ...


 Differential amplifier

Details
Inventors: Dick, Burkhard;
Assignee: U.S. Philips Corporation (New York, NY)
Primary Examiner: Lam; Tuan T.
Assistant Examiner:
Attorney, Agent or Firm: Biren; Steven R.

A differential amplifier includes a first amplifier transistor whose base terminal is coupled to an emitter terminal of a first emitter-follower transistor, a second amplifier transistor whose base terminal is coupled to an emitter terminal of a second emitter-follower transistor, a first emitter impedance across which the emitter terminals of the first and second amplifier transistors are coupled to each other, while base terminals of the emitter-follower transistors can be supplied with a differential voltage for controlling the differential amplifier. In order to enable stable operation and also a characteristic curve that is linear over rather large dynamic ranges, such a differential amplifier according to the invention includes a power transfer circuit by which a first current is supplied to the emitter terminal of the first emitter-follower transistor in a voltage-decoupled manner, which first current has such a predefined proportion to a collector current in a collector terminal of the second amplifier transistor due to the configuration of the first emitter-follower transistor and of the second amplifier transistor that a base-emitter voltage occurring on the first emitter-follower transistor substantially corresponds to a base-emitter voltage occurring on the second amplifier transistor. The power transfer circuit similarly applies a second current to the emitter terminal of the second emitter-follower transistor in a voltage-decoupled manner.

DETAILED DESCRIPTION What is claimed is: 1.
A differential amplifier comprising at least: a first amplifier transistor whose base terminal is coupled to an emitter terminal of a first emitter-follower transistor, a second amplifier transistor whose base terminal is coupled to an emitter terminal of a second emitter-follower transistor, a first emitter impedance across which the emitter terminals of the first and second amplifier transistors are coupled to each other, while base terminals of the emitter-follower transistors can be supplied with a differential voltage for controlling the differential amplifier, characterized by a power transfer circuit by which the emitter terminal of the first emitter-follower transistor, while being voltage decoupled, is supplied with a first current which has a proportion to a collector current in a collector terminal of the second amplifier transistor that is predefined by the configuration of the first emitter-follower transistor and of the second amplifier transistor, so that a base-emitter voltage occurring on the first emitter-follower transistor at least substantially matches a base-emitter voltage occurring on the second amplifier transistor and by which a second current is applied to the emitter terminal of the second emitter-follower transistor which is voltage decoupled, which second current has a proportion to a collector current in a collector terminal of the first amplifier transistor that is predefined by the configuration of the second emitter-follower transistor and of the first amplifier transistor, so that a base-emitter voltage occurring on the second emitter-follower transistor at least substantially matches a base-emitter voltage occurring on the first amplifier transistor.
2.
A differential amplifier as claimed in claim 1, characterized in that the power transfer circuit in the differential amplifier according to the invention comprises at least one current mirror arrangement for deriving the first or second current respectively from the collector currents of the amplifier transistors


Related patents
  Hazard-free clocked master/slave flip-flop
The present invention provides a clocked master/slave flip-flop comprising a master portion having plural similar logic elements for receiving at least data and clock ...
  Carrier detect circuit
An object of the invention is to provide an improved carrier detect circuit of the type described in U.S. Pat. No. 3,593,151 for preventing false startups of printing ...
  Processor supervisory circuit and method having increased range of power-on reset signal stability
To address the above-discussed deficiencies of the prior art, the present invention provides a novel, low-cost, discrete-component processor supervisory circuit. More ...
  Low-noise frequency divider
It is an object of the invention to remedy these drawbacks to a great extent by proposing a frequency divider which generates a single parasitic signal having a unique ...
  DC-to-DC converter functioning in a pulse-skipping mode with low power consumption and PWM inhibit
OF THE PREFERRED EMBODIMENTS The numerous innovative teachings of the present application will be described with particular reference to the presently preferred ...
  AC input cell for data acquisition circuits
What is claimed is: 1. An AC input cell, comprising: a first node; a second node; a first line coupled between said first node and said second node, said first line ...
  Signal-processing multiprocessor system
It is an object of the present invention to provide a signal-processing system which makes it possible to comply with these different requirements of speed and ...
  Microcoded microprocessor with shared ram
The present invention is a system for utilizing a single RAM array as a control store for microcode, and as a memory for other functions such as, for example, memory ...
  Buffer memory device capable of memorizing operand and instruction data blocks at different block sizes
What is claimed is: 1. In a buffer memory device intermediate between a central processing unit and a main memory and operable to selectively memorize and read out an ...
  Data transfer control unit permitting data access to memory prior to completion of data transfer
What is claimed is: 1. A data transfer control unit comprising: (a) first address register means for registering a first final address value of a memory area of a memory ...

0.004

Archive: All patents - Links

Copyright (c)2006 Eipa-patents.org - All rights reserved