Signal receiving circuit and method, signal detection circuit

A technology of signal reception and signal detection, applied in the field of signal detection circuit and signal reception circuit, can solve the problem of BMC data signal error signal and so on

Active Publication Date: 2021-03-30
FAIRCHILD SEMICON SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, after the existing BMC receiver performs waveform shaping processing on the data signal, even if the BMC data signal received from the CC pin is a correct signal, the digital circuit detects that the received BMC data signal is a wrong signal Phenomenon

Method used

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  • Signal receiving circuit and method, signal detection circuit
  • Signal receiving circuit and method, signal detection circuit
  • Signal receiving circuit and method, signal detection circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] This example is Figure 4 A specific application example of the circuit shown.

[0079] In this example, if Figure 6 As shown, the AC coupling circuit 311 includes: a first capacitor C1; the common mode voltage generation circuit 312 includes: a first resistor R1, a second resistor R2, a third switch S3 and a fourth switch S4; the first The current feedback clamping circuit 313 includes: a first current source I1 , a second current source I2 , a first switch S1 , a second switch S2 and an inverter INV. The resistance values ​​of the first resistor R1 and the second resistor R2 are the same; the first capacitor C1 is a DC blocking capacitor.

[0080] Figure 7 The waveform of the input voltage signal (CC_Input) is shown. combine Figure 7 shown in the waveform, Figure 6 The working principle of the signal receiving circuit shown is:

[0081] The first capacitor C1, the first resistor R1, and the second resistor R2 perform AC coupling on the input voltage signal ...

Embodiment 2

[0085] This example is Figure 5 A specific application example of the circuit shown.

[0086] In this example, if Figure 10 As shown, the filter circuit 314 includes: a second capacitor C2, a third resistor R3; the voltage clamping circuit 315 includes: a fourth resistor R4, a first P-channel metal oxide semiconductor field effect transistor (PMOS) M1 , a first N-channel metal oxide semiconductor field effect transistor (NMOS) M2; the second current feedback clamping circuit 316 includes: a third current source I3, a fourth current source I4, a second NMOS M3 and a second PMOS M4.

[0087] Figure 7 The waveform of the input voltage signal (CC_Input) is shown. combine Figure 7 shown in the waveform, Figure 10 The working principle of the signal receiving circuit shown is:

[0088] The second capacitor C2 and the third resistor R3 filter the input voltage signal (CC_Input), adjust the waveform of the input voltage signal (CC_Input) for the first time, and obtain the ...

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PUM

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Abstract

The invention discloses a signal receiving circuit, which receives an input voltage signal; the signal receiving circuit includes: an input voltage adjustment circuit and a comparison circuit; wherein, the input voltage adjustment circuit pre-adjusts the waveform of the input voltage signal, A first voltage signal is obtained; the comparison circuit compares the first voltage signal with a second voltage signal, and outputs a comparison voltage signal; the pulse width of the output comparison voltage signal satisfies a first preset condition; the first preset The condition characterizes that the input voltage signal can be correctly identified. The invention also discloses a signal detection circuit and a signal receiving method at the same time.

Description

technical field [0001] The invention relates to signal receiving technology, in particular to a signal receiving circuit and method, and a signal detection circuit. Background technique [0002] Biphase Mark Coding (BMC, Biphase Mark Coding) is a coding type used for binary data streams. It is a coding method in which clock signals and data signals are mixed together for transmission. Using BMC will make synchronization easier. [0003] During data transmission, there is an important circuit, the BMC receiver, whose function is to receive the BMC data signal (analog voltage signal) from the CC pin (pin), and perform corresponding waveform shaping processing on the received data signal, so that the digital circuit To detect whether the received BMC data signal is correct. [0004] However, after the existing BMC receiver performs waveform shaping processing on the data signal, even if the BMC data signal received from the CC pin is a correct signal, the digital circuit detec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/49
CPCH04L25/4904G05F1/575G05F1/59H03K5/08H03M5/12H04L7/0079H04L7/033H03K17/041
Inventor 黎兆宏孙伟明黄雷
Owner FAIRCHILD SEMICON SUZHOU
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