A signal receiving circuit and its realization method
A technology of signal reception and realization method, applied in the fields of electrical digital data processing, climate sustainability, instruments, etc., can solve the problems of BMC signal distortion and other problems, and achieve the effect of reducing the degree of BMC signal distortion
Active Publication Date: 2021-08-10
SOUTHCHIP SEMICON TECH SHANGHAI CO LTD
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[0005] The purpose of the present invention is to provide a signal receiving circuit and its implementation method, which mainly solves the problem of BMC signal distortion on the existing USB CC line
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[0026] Such as figure 1 As shown, the present invention discloses a signal receiving circuit, which is composed of resistors R1~R6, RLPF, capacitors CLPF, CHPF, two current sources IREF1, IREF2, two transmission gates and a comparator. The CC pin is the BMC signal input, connected to the capacitor CLPF through the resistor RLPF, and the other end of the capacitor CLPF is grounded to form a low-pass filter network to filter out the high-frequency noise of the BMC signal. The output node of the low-pass filter network is connected to one end of the capacitor CHPF, and the other end of the capacitor CHPF is connected to the common node B of the resistors R2 and R5. The capacitor CHPF, resistor R2 and resistor R5 are connected in parallel to form a high-frequency filter network, and the peak-to-peak value Vpeak_ac of the BMC signal Sample it out and superimpose it on node B. The resistors R1 and R4 are connected in series, the middle node is A, the resistors R2 and R5 are connect...
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The invention discloses a signal receiving circuit, which solves the problem of BMC signal distortion on the existing USB CC line. The circuit includes a low-pass filter network for filtering high-frequency noise of the BMC signal; a high-pass filter network for sampling the peak-to-peak value Vpeak_ac of the BMC signal; a high-voltage signal acquisition network for obtaining a high-voltage signal VREFH; A low-voltage signal acquisition network, used to obtain the low-voltage signal VREFL; two transmission gates, respectively used to transmit the high-voltage signal VREFH and low-voltage signal VREFL; a comparator, the negative terminal of the comparator is connected to the two transmission gates at the same time, The negative terminal INN of the comparator is connected to the superimposed signal of the peak-to-peak value Vpeak_ac, and the output terminal of the comparator outputs the signal BMC_IN. The receiving circuit of the BMC signal of the USB PD communication of the present invention can receive the USB PD communication BMC signal under different levels of power transmission, can solve the problem of the comparator operating point offset under different power supply voltages, and reduce the USB CC line Distortion degree of BMC signal on the
Description
technical field [0001] The present invention relates to the technical field of integrated circuits, in particular to a signal receiving circuit and its implementation method. Background technique [0002] With the development of electronic technology, the role of USB interface in electronic equipment has also evolved. In the early days of its birth, the USB interface was mainly used for data transmission, with a very limited power supply capability. Now, however, USB's power transmission has risen to be as important as data transmission. USB is gradually becoming a standard configuration interface for electronic equipment. Every day, hundreds of millions of portable electronic products, such as MP3 players, smartphones, tablet computers and smart wearable devices, obtain power through USB ports. [0003] With the development from USB 1.0 to USB BC 1.2, the power supply capacity of the USB interface has also been increased from 5V / 500mA to 5V / 1.5A, which meets the power su...
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IPC IPC(8): G06F13/40
CPCG06F13/4072G06F2213/0042Y02D10/00
Inventor 肖哲飞
Owner SOUTHCHIP SEMICON TECH SHANGHAI CO LTD