Mixer structure for doppler radar applications

Mixer circuit, comprising:

• an oscillator signal;
• an oscillator input port;
• said oscillator input port (LO) in communication with said oscillator signal;
• a radio frequency signal;
• a radio frequency input port (RF) in communication with said radio frequency signal;
• two mixer branches (12a, 12b), each mixer branch (12a, 12b) includes a rectifier circuit having a diode, a load resistor (22a, 22b), a decoupling capacitor (24a, 24b), a series resistor (14a, 14b) and a series capacitance (16a, 16b);
• said mixer branches (12a, 12b) are respectively connected to said oscillator input port (LO) and to said radio frequency input port (RF), said two mixer branches produce intermediate signals (IF1, 1F2);
• said intermediate signals (IF1, 1F2) correspond to a Doppler shift between said oscillator signal and said radio frequency signal;
• and, an output port outputting an overall output intermediate signal.

Mixer circuit, comprising:

• an oscillator generating oscillator signals;
• an oscillator input port (LO);
• said oscillator input port (LO) electrical communication with said oscillator signals generated by said oscillator;
• a receiving and transmission means;
• a radio frequency input port (RF);
• said radio frequency input pod (RF) in electrical communication with said receiving and transmission means;
• two mixer branches (12a, 12b), each mixer branch (12a, 12b) includes a rectifier circuit having a diode, a load resistor (22a, 22b), a decoupling capacitor (24a, 24b), a series resistor (14a, 14b) and a series capacitance (16a, (16b);
• said mixer branches (12a, 12b) are respectively connected to said oscillator input port (LO) and to said radio frequency input port (RF);
• said two mixer branches produce intermediate signals;
• said intermediate signals correspond to a Doppler shift between said oscillator signal and a radio frequency signal;
• an output port outputting an overall output signal produced in the mixer circuit;
• and,
• a coupler is inserted between said oscillator and said receiving and transmission means of said Doppler sensor.

Mixer structure (10;

• 110;
• 210;
• 310) for Doppler radar applications, comprising:
• an oscillator input port (LO) for oscillator signals output from an electric oscillator (32);
• a radio frequency input port (RF) for radio frequency signals from receiving means (34);
• an output port (IF;
• IFI, IFQ) for outputting an overall output intermediate signal produced in the mixer structure (10;
• 110;
• 210;
• 310);
• two mixer branches (12a, 12b), wherein each said mixer branch (12a, 12b) includes a rectifier circuit having a diode (18a, 18b;
• 118a, 118b), decoupling capacitor (24a, 24b), a load resistor (22a, 22b), a series resistor (14a, 14b) and a series capacitance (16a, 16b), and,
• said mixer branches (12a, 12b) are connected to said oscillator input port (LO) and said radio frequency (RF) and to a common output port (IF;
• IFI, IFQ), said intermediate signals (IF1, IF2) of said mixer branches (12a, 12b) correspond to a Doppler shift between said oscillator signal and said radio frequency signal, and said intermediate signals are processed to an overall output intermediate signal.

Doppler radar sensor (30;

• 130;
• 230;
• 330), comprising:
• an oscillator input port (LO) for oscillator signals output from an electric oscillator (32);
• a radio frequency input port (RF) for radio frequency signals from receiving means (34);
• an output port (IF;
• IFI, IFQ) for outputting an overall output intermediate signal produced in the mixer structure (10;
• 110;
• 210;
• 310);
• two mixer branches (12a, 12b), wherein each said mixer branch (12a, 12b) includes a rectifier circuit having a. diode (18a, 18b;
• 118a, 118b), a decoupling capacitor (24a, 24b), a load resistor (22a, 22b), a series resistor (14a, 14b) and a series capacitance (16a, 16b);
• said mixer branches (12a, 12b) are connected to said oscillator input port (LO) and said radio frequency port (RF) and to a common output port (IF;
• IFI, IFQ), said intermediate signals (IF1, IF2) of said mixer branches (12a, 12b) correspond to a Doppler shift between said oscillator signal and said radio frequency signal, and said intermediate signals are processed to an overall output intermediate signal;
• an output port. (IF;
• IFI, IFQ) for an overall output signal produced in said mixer structure (210;
• 310);
• and,
• said mixer structure (210;
• 310) resides between said oscillator (32) and said receiving and transmission means (34) of the Doppler sensor.