Back to results
US 10,764,096 B1Granted
Demodulator and method of demodulating ASK signal
AssigneeBeken Corporation
InventorsCunliang Nai, Jiazhou Liu
Life of this patent
Estimating the term…
Abstract
A new demodulator with consistent sensibility to signals received from different directions and low power consumption is provided. The demodulator may include a first demodulator branch and a second demodulator branch electrically connected in parallel, and a DC circuit to provide DC power to the demodulator. The DC circuit has a first diode and a second diode electrically connected in series between a DC power supply Vcc and the ground. The second demodulator branch can multiplex or reuse a bias current from the first demodulator branch.
Claims12
A demodulator comprising:
- a first demodulator branch comprising:
- a first antenna, a first coupling capacitor, a first band pass filter, a first low pass filter, and a first DC blocking capacitor that are electrically connected in series, wherein the first DC blocking capacitor is electrically connected to a load resistor;
- a second demodulator branch comprising:
- a second antenna, a second coupling capacitor, a second band pass filter, a second low pass filter, and a second DC blocking capacitor that are electrically connected in series, wherein the second DC blocking capacitor is electrically connected to the load resistor;
- and
- a DC circuit comprising:
- a DC power supply, a first bias resistor, a first diode, a choke inductor, a second bias resistor, and a second diode that are electrically connected in series, wherein an anode of the first diode is electrically connected to a first spot in the first demodulator branch, wherein an anode of the second diode is electrically connected to a second spot in the second demodulator branch, and wherein the DC circuit comprises a first bypass capacitor and a second bypass capacitor with different capacitances.
4 more elements
A method for demodulating an Amplitude Shift Keying (ASK) signal, comprising:
- receiving the ASK signal with a demodulator, the demodulator including:
- a first demodulator branch comprising:
- a first antenna, a first coupling capacitor, a first band pass filter, a first low pass filter, and a first DC blocking capacitor electrically connected in series, wherein the first DC blocking capacitor is electrically connected to a load resistor;
- a second demodulator branch comprising:
- a second antenna, a second coupling capacitor, a second band pass filter, a second low pass filter, and a second DC blocking capacitor electrically connected in series, wherein the second DC blocking capacitor is electrically connected to the load resistor;
- and
- a DC circuit comprising:
- a DC power supply, a first bias resistor, a first diode, a choke inductor, a second bias resistor, and a second diode electrically connected in series, wherein an anode of the first diode is electrically connected to a first spot in the first demodulator branch, wherein an anode of the second diode is electrically connected to a second spot in the second demodulator branch, and wherein the DC circuit comprises a first bypass capacitor and a second bypass capacitor with different capacitances;
- and
- demodulating the ASK signal with the demodulator.
7 more elements
A Composite Password Card (CPC) of an electronic toll collection system, comprising:
- a demodulator configured to demodulate an Amplitude Shift Keying (ASK) signal to obtain a base band signal;
- a wake-up circuit connected to the demodulator and configured to receive the base band signal;
- and
- a primary circuit connected to the wake-up circuit;
- wherein the demodulator comprises:
- a first demodulator branch comprising:
- a first antenna, a first band pass filter, and a first low pass filter electrically connected in series and connected to a load resistor;
- a second demodulator branch comprising:
- a second antenna, a second band pass filter, and a second low pass filter electrically connected in series and connected to the load resistor;
- and
- a DC circuit comprising:
- a DC power supply, a first bias resistor, a first diode, a choke inductor, a second bias resistor, and a second diode electrically connected in series, wherein an anode of the first diode is electrically connected to a first spot in the first demodulator branch, wherein an anode of the second diode is electrically connected to a second spot in the second demodulator branch, and wherein the DC circuit comprises a first bypass capacitor with a first capacitance and a second bypass capacitor with a second capacitance different from the first capacitance.
9 more elements
Dependencies are inferred from the claim text.