Integrated dual charge pump power supply and RS-232 transmitter/receiver
First Claim
1. A CMOS integrated single-chip voltage supply comprising:
- a means adapted to be connected to a supply voltage for charging a capacitor approximately to a supply voltage;
a means for coupling said charged capacitor in series with said supply voltage to create a source of positive voltage approximately double the supply voltage;
a means for inverting said doubled voltage making it available on the same chip, thereby providing source of two available supply voltages on the same chip, one being a positive voltage approximately two times said supply voltage, and the other being a negative voltage approximately two times said supply voltage; and
a means for inhibiting latch-up of four-layer diode devices inherently formed in CMOS integrated circuits.
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Accused Products
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. 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.
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Citations
68 Claims
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1. A CMOS integrated single-chip voltage supply comprising:
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a means adapted to be connected to a supply voltage for charging a capacitor approximately to a supply voltage; a means for coupling said charged capacitor in series with said supply voltage to create a source of positive voltage approximately double the supply voltage; a means for inverting said doubled voltage making it available on the same chip, thereby providing source of two available supply voltages on the same chip, one being a positive voltage approximately two times said supply voltage, and the other being a negative voltage approximately two times said supply voltage; and a means for inhibiting latch-up of four-layer diode devices inherently formed in CMOS integrated circuits. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. An integrated CMOS voltage supply and RS-232 transmitter circuit on the same semiconductor chip, comprising:
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an RS-232 transmitter circuit; a means adapted to be connected to a supply voltage for charging a capacitor approximately to a supply voltage; a means for coupling said charged capacitor in series with said supply voltage to create a source of positive voltage approximately double the supply voltage; a means for inverting said doubled voltage and making it available on the same chip, thereby providing a source of two available supply voltages on the same chip, one being a positive voltage approximately two times said supply voltage, and the other being a negative voltage approximately two times said supply voltage; a means for inhibiting latch-up of four-layer diode devices inherently formed in CMOS integrated circuits; and a means connecting said doubled voltage and said inverted doubled voltage to said RS-232 transmitter circuit for powering said RS-232 transmitter circuit. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56)
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57. An integrated CMOS voltage supply and RS-232 transmitter circuits on the same semiconductor chip, comprising:
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a plurality of RS-232 transmitter circuits; a means adapted to be connected to a supply voltage for charging a capacitor approximately to a supply voltage; a means for coupling said charged capacitor in series with said supply voltage to create a source of positive voltage approximately double the supply voltage; a means for inverting said doubled voltage and making it available on the same chip, thereby providing a source of two available supply voltages on the same chip, one being a positive voltage approximately two times said supply voltage, and the other being a negative voltage approximately two times said supply voltage; a means for inhibiting latch-up of four-layer diode devices inherently formed in CMOS integrated circuits; and a means connecting said doubled voltage and said inverted doubled voltage to said RS-232 transmitter circuits for powering said RS-232 transmitter circuits. - View Dependent Claims (58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68)
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Specification