COMPLETELY INTEGRATED RAMP GENERATOR HAVING RELATIVELY LARGETIME CONSTANT

摘要

PURPOSE: To provide the ramp generator of a small integrated area by arranging N-pieces of transistors of Darlington configuration, which are cascade-connected and H+k-pieces of diodes which are connected in series and which are directly biased. CONSTITUTION: Bipolar PNP transistors TrQ1-Q3 of Darlington configuration, which are cascade-connected, are used. The four diodes D1-D4 of PN junction are directly biased and they are connected in series between a reference current oscillator Ir and an integrated capacitance C. All used TrQ1-Tr3 and four TrD1-D4 in diode forms have the same minimum dimensions to which the manufacture process of an integrated circuit is permitted. Voltage drop V1-V2 passing through the directly biased PN junction of TrQ1-TrQ3 decides the biasing of the four diodes D1-D4 of PN junction, controls current I2 passing through diode chains D1-D4 and charges the capacitance C.