Dual double balanced mixer
AssigneeScientific Components Corporation
InventorDaxiong Ji
Life of this patent
Estimating the term…
Abstract
A double balanced mixer for mixing an RF input signal with a local oscillator signal to provide at an output an intermediate frequency signal with a high third order intercept point. A first and second local oscillator balun receives a local oscillator signal. A first and second RF balun receives a RF signal. A first mixer is coupled to the first local oscillator balun and the first RF balun. A second mixer is coupled in parallel with the first mixer. The second mixer is coupled to the second local oscillator balun and the second RF balun. The parallel coupled mixers provide an intermediate frequency signal. A first intermediate frequency balun is coupled to the first mixer and a second intermediate frequency balun is coupled to the second mixer. The mixer also has increased isolation.
Claims21
A double balanced mixer for mixing an RF input signal with a local oscillator signal to provide at an output an intermediate frequency signal with a high third order intercept point, comprising:
- (a) a first double balanced mixer having a first and second input port for receiving the local oscillator signal, the first mixer having a third and a fourth input port for receiving the RF signal, the first mixer further having a first and second output port for providing the intermediate frequency signal;
- and
- (b) a second double balanced mixer connected in parallel with the first double balanced mixer, the second double balanced mixer having a fifth and sixth input port for receiving the local oscillator signal, the second mixer having a seventh and eighth input port for receiving the RF signal, the second mixer further having a third and fourth output port for providing the intermediate frequency signal, the parallel connected first and second double balanced mixers reducing third order products and increasing the third order intercept point.
A double balanced mixer, comprising:
- (a) a first and second local oscillator balun operable to receive a local oscillator signal;
- (b) a first and second RF balun operable to receive a RF signal;
- (c) a first mixer having a first input port coupled to the first local oscillator balun, a second input port coupled to the first RF balun, and an output port providing an intermediate frequency signal;
- (d) a second mixer coupled in parallel with the first mixer, the second mixer having a first input port coupled to the second local oscillator balun, a second input port coupled to the second RF balun, and an output port providing an intermediate frequency signal;
- and
- (e) a first and second intermediate frequency balun, the first intermediate frequency balun coupled to the output port of the first mixer and the second intermediate frequency balun coupled to the output port of the second mixer, the parallel connected first and second mixers providing a high third order intercept point.
A method of double balanced mixing with a high third order intercept point, comprising:
- (a) applying a local oscillator signal to a first and second double balanced mixer, the first and second mixers connected in parallel, the first mixer having a first and second input port for receiving the local oscillator signal, a third and a fourth input port for receiving a RF signal and a first and second output port, the second double balanced mixer having a fifth and sixth input port for receiving the local oscillator signal, a seventh and eighth input port for receiving the RF signal and a third and fourth output port for providing an intermediate frequency signal;
- (b) applying an RF signal to the first and second mixers;
- (c) mixing the local oscillator signal with the RF signal in the first and second mixers to obtain an intermediate frequency signal;
- and
- (d) providing the intermediate frequency signal at an output.
A double balanced mixer for mixing an RF signal with a local oscillator signal to provide at an output an intermediate frequency signal with a high third order intercept point, comprising:
- (a) first and second local oscillator balun means for receiving a local oscillator signal;
- (b) first and second RF balun means for receiving an RF signal;
- (c) parallel coupled first and second mixer means, the first and second mixer means further coupled to the first and second local oscillator balun means and the first and second RF balun means, respectively;
- the first and second mixing means mixing the local oscillator signal and the RF signal to produce an intermediate frequency signal having a high third order intercept point;
- (d) first and second intermediate frequency balun means coupled to the first and second mixer means;
- and
- (e) a first capacitor connected between the first and second local oscillator balun means and the local oscillator signal and a second capacitor connected between the RF signal and ground.
Dependencies are inferred from the claim text.