# US 2021/0359668 A1 · Narrow pulse generation circuit used in sequential equivalent sampling system

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- Number: US 2021/0359668 A1
- Document ID: US20210359668A1
- Status: Published application
- Kind: A1
- Application number: 17/287,117
- Filed: 2019-01-14
- Published: 2021-11-18
- Earliest claimed: 2018-06-11
- Assignees: Nantong Institute of Nanjing University of Posts and Telecommunications Co., Ltd.
- Applicants: Nantong Institute of Nanjing University of Posts and Telecommunications Co.,Ltd.
- Inventors: Zhikuang CAI; Xuanchen QI; Wenhua LIN; Guowei SHI; Jian XIAO; Yufeng GUO
- Web page: https://patentgrep.com/patent/US20210359668A1

## CPC

- H03K 3/021: by the use, as active elements, of more than one type of element or means, e.g. BIMOS, composite devices such as IGBT
- H03B 5/362: {the amplifier being a single transistor (H03B5/364 - H03B5/368 take precedence)}
- H03K 5/07: by the use of resonant circuits
- H04B 1/04: Circuits
- H04B 1/24: the receiver comprising at least one semiconductor device having three or more electrodes
- H04B 2001/0408: {with power amplifiers}
- H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M)
- H03B: GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS (generators adapted for electrophonic musical instruments G10H; masers or lasers H01S; generation of oscillations in plasma H05H)
- H04B: TRANSMISSION

## Abstract

A narrow pulse generation circuit used in a sequential equivalent sampling system. The circuit comprises a crystal oscillator, an edge sharpening circuit, an avalanche transistor single-tube amplifying circuit and a shaping network connected in sequence, wherein the edge sharpening circuit is used for carrying out edge sharpening on a square wave signal generated by the crystal oscillator; the avalanche transistor single-tube amplifying circuit is used for carrying out avalanche amplification on the sharpened square wave signal to generate a Gaussian pulse signal to adjust the amplitude of a pulse; and the RC shaping network is used for shaping the Gaussian pulse signal to adjust the pulse width at the bottom of the pulse to form a narrow pulse signal. The narrow pulse circuit has a simple structure and narrow pulse width at the bottom and facilitates increasing a signal-to-noise ratio of a whole sequential sampling system.

## Claims

### Claim 1

A narrow pulse generation circuit used in a sequential equivalent sampling system, comprising: a crystal oscillator, an edge sharpening circuit, an avalanche transistor single-tube amplifying circuit, and an RC shaping network that are connected in sequence, wherein:
the edge sharpening circuit is used for carrying out edge sharpening on a square wave signal generated by the crystal oscillator;
the avalanche transistor single-tube amplifying circuit is used for carrying out avalanche amplification on the sharpened square wave signal to generate a Gaussian pulse signal to adjust the amplitude of a pulse; and
the RC shaping network is used for shaping the Gaussian pulse signal to adjust the pulse width at the bottom of the pulse to form a narrow pulse signal.

### Claim 2 (depends on 1)

The narrow pulse generation circuit used in a sequential equivalent sampling system according to claim 1, wherein the edge sharpening circuit comprises a first resistor R1, a first capacitor C1, a second resistor R2, a step recovery diode SRD, a second capacitor C2, and a sixth resistor R6, wherein the first resistor R1, the first capacitor C1, the second capacitor C2, the sixth resistor R6, and a negative terminal of a power supply are connected in sequence; one end of the crystal oscillator is grounded, and the other end of the crystal oscillator is connected to the first resistor R1; one end of the step recovery diode SRD is grounded, and the other end of the step recovery diode SRD is connected between the first capacitor C1 and the second capacitor C2; and one end of the second resistor R2 is connected to a positive terminal of the power supply, and the other end of the second resistor R2 is connected between the first capacitor C1 and the second capacitor C2.

### Claim 3 (depends on 1)

The narrow pulse generation circuit used in a sequential equivalent sampling system according to claim 1, wherein the avalanche transistor single-tube amplifying circuit comprises a first resistor R5, an avalanche transistor Q1, a third resistor R3, a first inductor L1, a fourth resistor R4, a third capacitor C3, a fourth capacitor C4, and a seventh resistor R7, wherein one end of the first resistor R5 is connected to an end of the second capacitor C2 that is connected to a negative terminal of a power supply, and the other end of the first resistor R5 is connected to a base of the avalanche transistor Q1; an emitter of the avalanche transistor Q1 is grounded; and a collector of the avalanche transistor Q1, the third resistor R3, the first inductor L1, the fourth resistor R4, and a positive terminal of the power supply are connected in sequence; one end of the third capacitor C3 is grounded, and the other end of the third capacitor C3 is connected between the first inductor L1 and the fourth resistor R4; one end of the fourth capacitor C4 is connected to the collector of the avalanche transistor Q1, and the other end of the fourth capacitor C4 is connected to the seventh resistor R7; and the seventh resistor R7 is grounded.

### Claim 4 (depends on 1)

The narrow pulse generation circuit used in a sequential equivalent sampling system according to claim 1, wherein the RC shaping network comprises a fifth capacitor C5, a Schottky diode D2, a coupling capacitor Cc, a load resistor RL, a ninth resistor R9, a second inductor L2, a sixth capacitor C6, and a tenth resistor R10, wherein one end of the fifth capacitor C5 is connected between the fourth capacitor C4 and the seventh resistor R7; and the other end of the fifth capacitor C5, the Schottky diode D2, the coupling capacitor Cc, and the load resistor RL are connected in sequence; the load resistor RL is grounded; one end of the ninth resistor R9 is connected between the fifth capacitor C5 and the Schottky diode D2; and the other end of the ninth resistor R9, the second inductor L2, and the tenth resistor R10 are connected in sequence; the tenth resistor R10 is connected to a positive terminal of a power supply; one end of the sixth capacitor C6 is grounded, and the other end of the sixth capacitor C6 is connected between the second inductor L2 and the tenth resistor R10.

### Claim 5 (depends on 1)

The narrow pulse generation circuit used in a sequential equivalent sampling system according to claim 1, wherein a differential constant τ in the avalanche transistor single-tube amplifying circuit is less than the width of a positive pulse edge.

### Claim 6 (depends on 1)

The narrow pulse generation circuit used in a sequential equivalent sampling system according to claim 1, wherein the square wave sharpened by the edge sharpening circuit has a rising edge of 0.9 ns to 1.1 ns.