Receiving device, signal reception method and transmission system

Abstract

A receiving device for a transmission system includes a demodulation module for receiving a modulated signal through a digital isolator of the transmission system and demodulating the modulated signal into a demodulated signal; a comparator coupled to the demodulation module for comparing a signal component of the demodulated signal with a dynamic threshold voltage to generate an output logic signal; and a threshold voltage adjustment module coupled to the demodulation module and the comparator for determining a peak voltage level and a common-mode voltage level of the demodulated signal, and dynamically determining the dynamic threshold voltage based on the peak voltage level and the common-mode voltage level; wherein the dynamic threshold voltage is an average level of the peak voltage level and the common-mode voltage level.

Claims

1. A receiving device for a transmission system, comprising: a demodulation module for receiving a modulated signal through a digital isolator of the transmission system and demodulating the modulated signal into a demodulated signal; a comparator coupled to the demodulation module for comparing a signal component of the demodulated signal with a dynamic threshold voltage to generate an output logic signal; and a threshold voltage adjustment module coupled to the demodulation module and the comparator for determining a peak voltage level and a common-mode voltage level of the demodulated signal, and dynamically determining the dynamic threshold voltage based on the peak voltage level and the common-mode voltage level; wherein... The dynamic critical voltage is an average level of the peak voltage level and the common-mode voltage level.

2. The receiving apparatus as claimed in claim 1, wherein the demodulated signal includes the signal component and a common-mode component, the signal component having the peak voltage level and the common-mode component having the common-mode voltage level.

3. The receiving apparatus as claimed in claim 2, wherein the demodulation module comprises: an amplifier circuit for amplifying the modulation signal with a first gain to generate a first amplified signal, and amplifying the modulation signal with a second gain to generate a second amplified signal; and an integrator circuit coupled to the amplifier circuit for integrating the first amplified signal to generate the signal component, and integrating the second amplified signal to generate the common-mode component.

4. The receiving apparatus as claimed in claim 1, wherein the demodulated signal includes the signal component, a common-mode component and a high-voltage component, the common-mode component having the common-mode voltage level, the high-voltage component having the peak voltage level, and the high-voltage component corresponding to an auxiliary signal in the modulation signal.

5. The receiving apparatus as claimed in claim 4, wherein the demodulation module comprises: an amplifier circuit for amplifying the modulation signal with a first gain to generate a first amplified signal, amplifying the modulation signal with a second gain to generate a second amplified signal, and amplifying the auxiliary signal with a third gain to generate a third amplified signal; and an integrator circuit coupled to the amplifier circuit for integrating the first amplified signal to generate the signal component, integrating the second amplified signal to generate the common-mode component, and integrating the third amplified signal to generate the high-voltage component.

6. The receiving device as described in claim 5, wherein the auxiliary signal is continuously transmitted via an auxiliary channel of the transmission system.

7. The receiving device as claimed in claim 5, wherein the auxiliary signal is embedded in the modulation signal via time-division multiplexing, and the demodulation module further includes a time-division control circuit for extracting the auxiliary signal from the modulation signal.

8. The receiving apparatus as claimed in claim 1, wherein the threshold voltage adjustment module comprises: a peak detection circuit coupled to the demodulation module for detecting and storing the peak voltage level of the demodulated signal; a common-mode detection circuit coupled to the demodulation module for detecting and storing the common-mode voltage level of the demodulated signal; and an averaging circuit coupled to the peak detection circuit, the common-mode detection circuit and the comparator for averaging the peak voltage level and the common-mode voltage level to generate the dynamic threshold voltage and outputting the dynamic threshold voltage to the comparator.

9. A signal receiving method for a transmission system, comprising the following steps: receiving a modulated signal through a digital isolator of the transmission system; demodulating the modulated signal into a demodulated signal; determining a peak voltage level and a common-mode voltage level of the demodulated signal; dynamically determining a dynamic threshold voltage based on the peak voltage level and the common-mode voltage level; and comparing a signal component of the demodulated signal with the dynamic threshold voltage to generate an output logic signal; wherein, The dynamic critical voltage is an average level of the peak voltage level and the common-mode voltage level.

10. A transmission system comprising: a digital isolator; a transmitting module coupled to the digital isolator for modulating an input signal into a modulated signal and transmitting it to the digital isolator; and a receiving device comprising: a demodulation module coupled to the digital isolator for receiving the modulated signal through the digital isolator and demodulating the modulated signal into a demodulated signal; a comparator coupled to the demodulation module for comparing a signal component of the demodulated signal with a dynamic threshold voltage to generate an output logic signal; and a threshold voltage adjustment module coupled to the demodulation module and the comparator for determining a peak voltage level and a common-mode voltage level of the demodulated signal, and dynamically determining the dynamic threshold voltage based on the peak voltage level and the common-mode voltage level; wherein... The dynamic critical voltage is an average level of the peak voltage level and the common-mode voltage level.

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