Ultra low power wideband non-coherent binary phase shift keying demodulator using first order sideband filters with phase zero alignment
First Claim
1. An ultra low power wideband non-coherent binary phase shift keying (BPSK) demodulation circuit using first order sideband filters with phase zero alignment, the ultra low power wideband non-coherent BPSK demodulation circuit comprises:
- a sideband separation and upper sideband signal delay unit to output a lower sideband analog signal and a phase delayed analog signal to be delayed with preset phase from upper sideband analog signal, when a modulation signal in the input of the unit is divided to an upper sideband and a lower sideband by 1st order filters whose cutoff frequency is same as carrier frequency;
a data demodulation unit to demodulate digital data through a hysteresis circuit that latches an analog pulse signal to appear in the phase changing edge of BPSK modulation signal, in accordance with a phase difference between the lower sideband analog signal and the phase delayed analog signal being set to phase 0°
; and
a data clock recovery unit to recover data clock using a digitized signal from the lower sideband analog signal and the demodulated digital data,wherein the sideband separation and upper sideband signal delay unit comprises;
a 1st order low-pass filter (1st order LPF) whose cutoff frequency is the same as carrier frequency, configured to isolate lower sideband from the modulation signal;
a 1st order high-pass filter (1st order HPF) whose cutoff frequency is the same as carrier frequency, configured to isolate upper sideband from the modulation signal; and
a delay circuit to delay with preset phase from upper sideband analog signal that is the output of the 1st order HPF,wherein the data demodulation unit comprises;
a subtracter to generate an analog pulse signal to appear in the phase changing edge of the modulation signal, the edge being caused by the difference of analog signals which are the lower sideband analog signal and the phase delayed analog signal in accordance with the phase difference between the analog signals being set to phase 0°
; and
a Schmitt trigger that is a hysteresis circuit to demodulate digital data by latching the analog pulse signal,wherein the data clock recovery unit comprises;
a comparator to digitize from the lower sideband analog signal; and
an exclusive-NOR gate to compare the digitized lower sideband analog signal with the demodulated digital data signal, andwherein the upper sideband analog signal that is from the output of 1st order filter, occurs faster than the lower sideband analog signal by π
/2 or ¼
period of carrier frequency, and the phase delayed analog signal occurs through the delay circuit to delay π
/2 or ¼
period of carrier frequency for finding phase changing edge with aligning phase 0°
difference between the phase delayed analog signal and the lower sideband analog signal.
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Abstract
An embodiment of the present invention relates to an ultra low power wideband asynchronous binary phase shift keying (BPSK) demodulation method and a circuit configuration thereof. The ultra low power wideband asynchronous BPSK demodulation circuit comprises a sideband division and upper sideband signal delay unit dividing a modulated signal into an upper sideband and a lower sideband by a first order high-pass filter and a first order low-pass filter; a data demodulation unit latching, through a hysteresis circuit, a signal generated by a difference between the analog signals in which a phase difference between the delayed upper sideband analog signal and the lower sideband analog signal is aligned at 0°, so as to demodulate digital data; and a data clock recovery unit for generating a data clock by using a signal digitalized from the lower sideband analog signal through a comparator and a data signal.
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Citations
5 Claims
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1. An ultra low power wideband non-coherent binary phase shift keying (BPSK) demodulation circuit using first order sideband filters with phase zero alignment, the ultra low power wideband non-coherent BPSK demodulation circuit comprises:
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a sideband separation and upper sideband signal delay unit to output a lower sideband analog signal and a phase delayed analog signal to be delayed with preset phase from upper sideband analog signal, when a modulation signal in the input of the unit is divided to an upper sideband and a lower sideband by 1st order filters whose cutoff frequency is same as carrier frequency; a data demodulation unit to demodulate digital data through a hysteresis circuit that latches an analog pulse signal to appear in the phase changing edge of BPSK modulation signal, in accordance with a phase difference between the lower sideband analog signal and the phase delayed analog signal being set to phase 0°
; anda data clock recovery unit to recover data clock using a digitized signal from the lower sideband analog signal and the demodulated digital data, wherein the sideband separation and upper sideband signal delay unit comprises; a 1st order low-pass filter (1st order LPF) whose cutoff frequency is the same as carrier frequency, configured to isolate lower sideband from the modulation signal; a 1st order high-pass filter (1st order HPF) whose cutoff frequency is the same as carrier frequency, configured to isolate upper sideband from the modulation signal; and a delay circuit to delay with preset phase from upper sideband analog signal that is the output of the 1st order HPF, wherein the data demodulation unit comprises; a subtracter to generate an analog pulse signal to appear in the phase changing edge of the modulation signal, the edge being caused by the difference of analog signals which are the lower sideband analog signal and the phase delayed analog signal in accordance with the phase difference between the analog signals being set to phase 0°
; anda Schmitt trigger that is a hysteresis circuit to demodulate digital data by latching the analog pulse signal, wherein the data clock recovery unit comprises; a comparator to digitize from the lower sideband analog signal; and an exclusive-NOR gate to compare the digitized lower sideband analog signal with the demodulated digital data signal, and wherein the upper sideband analog signal that is from the output of 1st order filter, occurs faster than the lower sideband analog signal by π
/2 or ¼
period of carrier frequency, and the phase delayed analog signal occurs through the delay circuit to delay π
/2 or ¼
period of carrier frequency for finding phase changing edge with aligning phase 0°
difference between the phase delayed analog signal and the lower sideband analog signal. - View Dependent Claims (2, 3, 4)
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5. An ultra low power wideband non-coherent binary phase shift keying (BPSK) demodulation method using first order sideband filters with phase zero alignment, the ultra low power wideband non-coherent BPSK demodulation method comprises:
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a sideband separation and upper sideband signal delay step to output a lower sideband analog signal and a phase delayed analog signal to be delayed with preset phase from upper sideband analog signal, when a modulation signal in the input of the stage is divided to an upper sideband and a lower sideband by 1st order filters whose cutoff frequency is same as carrier frequency; a data demodulation step to demodulate digital data through a hysteresis circuit that latches an analog pulse signal to appear in the phase changing edge of BPSK modulation signal, in accordance with a phase difference between the lower sideband analog signal and the phase delayed analog signal being set to phase 0°
; anda data clock recovery step to recover data clock using a digitized signal from the lower sideband analog signal and above demodulated digital data, wherein the sideband separation and upper sideband signal delay step comprises; a step to isolate lower sideband from the modulation signal by a 1st order low-pass filter (1st order LPF) whose cutoff frequency is the same as carrier frequency; a step to isolate upper sideband from the modulation signal by 1st order high-pass filter (1st order HPF) whose cutoff frequency is the same as carrier frequency; and a delay step to delay with preset phase from upper sideband analog signal that is the output of the 1st order HPF, the data demodulation step comprises; a step to generate an analog pulse signal to appear in the phase changing edge of the modulation signal by a subtracter, and the edge is caused by the difference of analog signals which are the lower sideband analog signal and the delayed upper sideband analog signal because the phase difference between the analog signals is set to phase 0°
; anda step to demodulate digital data through latching the analog pulse signal by a Schmitt trigger that is a hysteresis circuit, wherein the data clock recovery step comprises; a step to convert a digital signal from the lower sideband analog signal by a comparator; and a step to recover a data clock for comparing the converted lower sideband analog signal with the demodulated digital data by an exclusive-NOR gate, and wherein the upper sideband analog signal that is from the output of 1st order filter, occurs faster than the lower sideband analog signal by π
/2 or ¼
period of carrier frequency, and the phase delayed analog signal occurs through the delay circuit to delay π
/2 or ¼
period of carrier frequency for finding phase changing edge with aligning phase 0°
difference between the phase delayed analog signal and the lower sideband analog signal.
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Specification