H - Electricity – 03 – K
Patent
H - Electricity
03
K
330/15, 328/193,
H03K 6/04 (2006.01) H03G 11/00 (2006.01) H03G 11/08 (2006.01) H03K 19/0185 (2006.01)
Patent
CA 1261011
ABSTRACT METHOD FOR THE DIGITAL SLOPE CONTROL OF THE OUTPUT SIGNALS OF POWER AMPLIFIERS OF SEMICONDUCTOR CHIPS WITH VLSI CIRCUITS FOR A COMPUTER A method for the digital slope control of the output signals of power amplifiers, as well as a power amplifier suitable for carrying out the method are described. One way of representing the actual slope value is via the number of clock pulses applied to a counter (10) during a measuring interval which depends in its duration on the slope. Such a measuring interval is produced by applying the pulses of a ring oscillator (1) containing one of the power amplifiers (2) to another counter (9) until the overflow of the latter. Another mode of representing the actual slope value consists in counting the number of pulses of the ring oscillator (1) during a measuring interval of predetermined duration. Actual and nominal values of the slope are compared. The results of this comparison change the contents of a left/right-shift register (19). Its parallel outputs (21) influence via control line (22) control inputs (23) of the power amplifiers in order to alter their slope by switching on or off output transistors arranged in parallel with respect to their switching paths.
548403
Ludwig Thomas
Schettler Helmut
Wagner Otto
Zuhlke Rainer
International Business Machines Corporation
Saunders Raymond H.
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