Browse Prior Art Database

Current Mirror Circuit with Compensation Circuit

IP.com Disclosure Number: IPCOM000106589D
Original Publication Date: 1993-Nov-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Moritani, A: AUTHOR [+4]

Abstract

Disclosed is a circuit for current mirror to compensate temperature, power voltage and device characteristics dependency. This current mirror circuit controls the current of current controlled inverters especially, and as a result a propagation delay of the current controlled circuit is kept constant on any conditions.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 94% of the total text.

Current Mirror Circuit with Compensation Circuit

      Disclosed is a circuit for current mirror to compensate
temperature, power voltage and device characteristics dependency.
This current mirror circuit controls the current of current
controlled inverters especially, and as a result a propagation delay
of the current controlled circuit is kept constant on any conditions.

      The Figure shows the current mirror circuit diagram with
compensation, which is a control circuit for current controlled
inverters.  One of the features of this current mirror circuit is
that there is one input signal (Vin) and two output signals
(Voutp,Voutn) and one control signal(Vcnt); the control signal
controls two output signals simultaneously.

      Next, the compensation mechanism is explained below.  T1,T2
source-drain current (I1) is decreased under the condition that the
current of the current controlled inverter (I0) is decreased.  The
voltage of Vcnt is increased because the drop-down-voltage by R1 is
decreased.  This voltage of Vcnt controls T3 and T4 gate voltage.
Current of T3 is increased and gate voltage of T5 goes higher.  On
the other hand, current of T4 is increased and source voltage of T5
goes lower.  Then, gate-source voltage of T5 becomes larger and
source-drain current of T5 is increased.  Finally, Voutp goes to
lower and Voutn goes higher and the current of current controlled
inverter (I0) keeps the constant value.

      Typical applications of t...