Title:
【発明の名称】パワダウン特性とRS-232送信機/受信機とを含む集積二重電荷ポンプ電源回路
Document Type and Number:
Japanese Patent JP2535173
Kind Code:
B2
Abstract:
A monolithic integrated circuit containing an inverting/non-inverting voltage doubler charge pump circuit is disclosed for converting a unipolar supply voltage to a bipolar supply voltage of a greater magnitude. The unipolar input voltage is placed across a first external transfer capacitor by a first set of MOS switches during a first time period. The unipolar input voltage source is placed in series with the first transfer capacitor and this series combination of voltages is placed across a first external reservoir capacitor by a second set of MOS switches during a second time period. The voltage appearing across the first external reservoir capacitor is placed on a second transfer capacitor during the first time period by a third set of MOS switches. The voltage across the second transfer capacitor is placed into a second external reservoir capacitor with its polarity inverted by a fourth set of MOS switches during the second time period. A dual-collector lateral junction transistor, formed during the conventional CMOS processing steps used to fabricate the MOS switches, is connected as a voltage clamp between a ground potential and the two bipolar DC output lines of the power supply circuit to assure correct start-up conditions for the circuit. Gain reduction devices are placed in the semiconductor substrate to collect minority carriers which would otherwise be injected into inherent parasitic four layer PNPN junction devices created as a result of the architecture of the circuit, to prevent latch-up of the four layer devices. In a preferred embodiment, an RS-232 receiver and transmitter are contained on the same monolithic integrated circuit as the dual charge pump power supply.
Inventors:
ROTSUJAA DABURYU FUURAA
DEIBITSUDO BINGAMU
DEIBITSUDO BINGAMU
Application Number:
JP13762087A
Publication Date:
September 18, 1996
Filing Date:
May 29, 1987
Export Citation:
Assignee:
MAKISHIMU INTEIGUREITEIDO PURODAKUTSU INC
International Classes:
G05F3/20; G11C5/14; H02M3/07; (IPC1-7): H02M3/07
Domestic Patent References:
| JP57101563A | ||||
| JP6192162A | ||||
| JP59230462A | ||||
| JP5780264A | ||||
| JP5121124A | ||||
| JP5320407U |
Other References:
【文献】米国特許4812961(US,A)
【文献】米国特許4636930(US,A)
【文献】米国特許4679134(US,A)
【文献】米国特許4777577(US,A)
【文献】米国特許4809152(US,A)
【文献】米国特許4999761(US,A)
【文献】米国特許4636930(US,A)
【文献】米国特許4679134(US,A)
【文献】米国特許4777577(US,A)
【文献】米国特許4809152(US,A)
【文献】米国特許4999761(US,A)
Attorney, Agent or Firm:
Yoshio Kawaguchi (1 person outside)