Method and apparatus for generating pulses from analog waveforms

• US 6,456,216 B2
• Filed: 04/11/2001
• Issued: 09/24/2002
• Est. Priority Date: 10/28/1999
• Status: Expired due to Fees

• Current Assignee: National University of Singapore
• Original Assignee: National University of Singapore
• Inventors: Joe, Jurianto
• Primary Examiner(s): JEAN PIERRE, PEGUY
• Application Number:
  US09/833,505
• Publication Number:
  US 20010019312A1
• Time in Patent Office: 531 Days
• Field of Search: 341/133, 341/111, 318/798, 331/74, 327/514, 330/284, 375/239, 375/371
• US Class Current: 341/133
• CPC Class Codes: H03K 3/313 by the use, as active elements, of semiconductor devices with two electrodes, one or two potential barriers, and exhibiting a negative resistance characteristic
• CPC Class Codes: H03K 3/315 the devices being tunnel diodes
• CPC Class Codes: H04B 1/71637 Receiver aspects H04B1/7183 takes precedence

Abstract

A method and apparatus are provided for generating output pulses or oscillations in response to input analog waveforms which involves exciting, with a known but arbitrary analog waveform, a circuit with a variable operating point and having a transfer function characterized by an unstable operating region bounded by a first stable operating region and a second stable operating region. The analog waveform is characterized by having a first information region and a second information region. In response to sensing the first and second information regions, the operating point of the circuit is forced into its unstable and stable regions. This produces a sequence of oscillatory and non-oscillatory behavior at the circuit'"'"'s output.

Claims

1. A method for recovering information from a single cycle of an analog waveform comprising:

receiving a transmitted signal and processing said transmitted signal to produce a received signal comprising said analog waveform;

producing a first group of one or more pluses based on a first portion of said analog waveform; and

producing at least one symbol based on said first group of pulses.

2. The method of claim 1 wherein said step of producing said first group of one or more pulses includes detecting a first sloped portion of said analog waveform or a first amplitude of said analog waveform.

3. A method for producing information from an analog waveform, said analog waveform having measurements of slope and amplitude, said method comprising:

detecting a first measurement having a first value and in response thereto producing a first group of one or more pulses; and

based on said first group of pulses, producing at least one symbol.

4. The method of claim 3 wherein said step of producing at least one symbol is a step of producing a single symbol based on said first group of pulses.

5. A communication method comprising:

producing an analog waveform representative of one or more symbols;

transmitting said analog waveform;

receiving said analog waveform;

detecting portions of said analog waveform to produce one or more groups of one or more pulses; and

reproducing said one or more symbols from said one or more groups of one or more pulses.

6. The method of claim 5 wherein said analog waveform comprises a plurality of single cycle analog waveforms, each single cycle analog waveform corresponding to one of said one or more symbols.

7. The method of claim 5 wherein said detecting includes detecting sloped portions of said analog waveform.

8. The method of claim 5 wherein said detecting includes detecting amplitudes of said analog waveform.

9. A circuit system for recovering information from one cycle of an analog waveform comprising:

a first circuit having an input for receiving said analog waveform, said first circuit responsive to a first measurement of said analog waveform by producing a first group of pulses; and

a decoder circuit coupled to receive said first pulses from at least said first circuit, said decoder configured to produce at least one symbol based on said first pulses.

10. The circuit system of claim 9 wherein said first measurement is a slope of said analog waveform.

11. The circuit system of claim 9 wherein said first measurement is an amplitude of said analog waveform.

12. The circuit system of claim 9 wherein said decoder circuit is configured to produce a single symbol based on said first group of pulses.

13. The circuit system of claim 9 further including a receiver circuit for receiving a transmitted signal, said receiver circuit configured to extract said analog waveform from said transmitted signal.

14. The circuit of claim 9 wherein said first circuit is characterized by a transfer function having at least one unstable operating region bounded by two stable operating regions.