PULSE GENERATOR WITH SWITCHED CAPACITORS

• US 20170047914A1
• Filed: 08/12/2015
• Published: 02/16/2017
• Est. Priority Date: 08/12/2015
• Status: Abandoned Application

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Hosokawa, Kohji, Ishii, Masatoshi, Ritter, Mark B., Yasuda, Takeo
• Application Number:
  US14/824,382
• Publication Number:
  US 20170047914A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01L 28/40 Capacitors
• CPC Class Codes: H03K 3/356 Bistable circuits
• CPC Class Codes: H03K 4/023 by repetitive charge or discharge of a capacitor, analogue generators

Abstract

A pulse generator and a method of fabricating a pulse generator are described. The pulse generator includes an input node to receive an input voltage, a first capacitor, and a second capacitor. The first capacitor is positioned between the input node and the second capacitor. An output node outputs an output voltage with a pulse shape, and the pulse generator also includes at least one switch between the input node and the second capacitor. The at least one switch controls the pulse shape of the output voltage.

Claims

1. A pulse generator, comprising:

an input node configured to receive a constant input voltage;

a first capacitor;

a second capacitor, the first capacitor positioned between the input node and the second capacitor;

an output node configured to output an output voltage with a pulse shape; and

at least one switch between the input node and the second capacitor, the at least one switch controlling the pulse shape of the output voltage.

3. The pulse generator according to claim 1, wherein the at least one switch is one switch coupled to a first capacitor node of the first capacitor, the one switch configured to alternately connect the first capacitor node to the input node and a second capacitor node of the second capacitor that is coupled to the output node.

4. The pulse generator according to claim 1, wherein the at least one switch is a first switch and a second switch.

5. The pulse generator according to claim 4, wherein the first switch connects the first capacitor to the input node in the first switch on position, the second switch connects the first capacitor to the second capacitor coupled to the output node in the second switch on position, and the first switch is in the first switch on position only when the second switch is not in the second switch on position.

6. The pulse generator according to claim 1, wherein the at least one switch is implemented with a transfer gate and an inverter.

7. The pulse generator according to claim 6, further comprising a first metal-oxide-semiconductor field effect transistor (MOSFET) and a second MOSFET.

8. The pulse generator according to claim 7, wherein an initial value of the output voltage is set based on either the first MOSFET or the second MOSFET.

9. The pulse generator according to claim 7, wherein the first MOSFET and the second MOSFET are controlled by respective MOSFET signals.

10. The pulse generator according to claim 6, further comprising an initialization switch additional to the at least one switch controlling the pulse shape of the output voltage.

11. The pulse generator according to claim 10, wherein an initial value of the output voltage is set based on the initialization switch.

12. The pulse generator according to claim 1, wherein the at least one switch is operated by a respective control signal.

13. The pulse generator according to claim 1, wherein at least one of the first capacitor and the second capacitor is a variable capacitor, and a ratio of the first capacitor and the second capacitor additionally controls the pulse shape of the output voltage.

2. (canceled)

14-20. -20. (canceled)