H - Electricity – 01 – B
Patent
H - Electricity
01
B
325/28
H01B 1/00 (2006.01) H03F 3/72 (2006.01) H03M 3/02 (2006.01)
Patent
CA 1068346
ABSTRACT A pulse code modulation transmission device com- prising a transmitter and a receiver each being provided with a dynamic control circuit and modulator built up of a first controlled current source circuit supplying a supply current for a difference amplifier which is con- trolled by a output pulses form the transmitter and incorpora- ting in its two output circuits pnp current mirror circuits whose outputs are connected to the output of a modulator directly and through a precision polarity reversing circuit, respectively. The control input of the first current source circuit is coupled to the output of the dynamic control circuit as well as to the input of a fourth current source circuit arranged in parallel therewith whose output is connected in the manner of a feedback through a pnp-current mirror circuit to a npn-current mirror circuit whose output is coupled to the output of the dynamic control circuit. -22-
245173
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