CMOS PECL driver with programmable current for varying voltage s

Details CMOS PECL driver with programmable current for varying voltage s CMOS PECL driver with programmable current for varying voltage s

1997-04-28

1999-02-23

Tokar, Michael

Electronic digital logic circuitry

Interface

Current driving

326 82, 326 86, H03K 19094

Patent

active

058748377

ABSTRACT:
A differential-output current driver is constructed entirely of CMOS transistors. Pseudo-ECL levels are reached when a standard resistive termination is connected to the outputs. The current driver can also drive a non-standard termination to the PECL levels. The non-standard termination is low power because it does not draw standby current from power to ground. Current from the current sources within the current driver are assigned to either the switching current or the constant current. The constant current is applied directly to the outputs to drive the termination to a bias point. The switching current is applied to a differential pair of transistors which switch the switching current to one or the other of the differential outputs in response to a differential input. The constant current is combined with any switching current output from the differential transistors and applied to the differential outputs to drive the external termination. For the non-standard termination, the differential outputs are driven with more constant current and less switching current than for the standard termination. The transconductance of the differential pair of transistors may also be increased when the switching current is increased. Thus the current-drive characteristics of a current driver are altered for different terminations. A half-sized voltage-swing option is also included.

REFERENCES:
patent: 5495184 (1996-02-01), Des Rosiers et al.
patent: 5541527 (1996-07-01), Ma
patent: 5548230 (1996-08-01), Gerwson et al.
patent: 5656952 (1997-08-01), McCall et al.
patent: 5767699 (1998-06-01), Bosnyak et al.

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