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US 6,317,590 B1Granted
Mixer for a receiver
AssigneeNokia Mobile Phones Ltd.
InventorsAdrian P. Nash, Sean Brett
Life of this patent
Estimating the term…
Abstract
A sub-harmonically pumped mixer has an anti-parallel diode pair switchable at twice the local oscillator frequency. Preferably, there are provided dual anti-parallel diode pairs. The local oscillator is coupled to the diode pairs by means of an unbalanced to balanced transformer. The balanced output of the transformer is coupled to the diodes and provides anti-phased signals to respective ones of anti-parallel diode pairs.
Claims13
A receiver for a portable radio communication apparatus comprising:
- a first port for inputting a received frequency signal;
- a second port for inputting a local oscillator signal;
- means for rectifying the input local oscillator signal to provide a conductance waveform at a multiple of the local oscillator signal, wherein the rectifying means and a coupling means comprise:
- a phase splitter and a plurality of transistors arranged in a network, wherein a signal output from a driver transistor drives the transistor network at a multiple of the local oscillator frequency;
- and
- means for mixing the received frequency signal with the conductance waveform at said multiple of the local oscillator signal frequency for down-converting the received frequency signal to an intermediate frequency signal.
3 more elements
Apparatus for a sub-harmonically pumped mixer, comprising:
- switching means;
- a first port for inputting a first frequency signal to the switching means;
- a transformer having an output electrically coupled to the switching means;
- and
- a second port for inputting a local oscillator signal to an input of the transformer, wherein the transformer and the switching means comprise:
- a rectifying and coupling means to rectify the input local oscillator signal to provide a conductance waveform at a multiple of the local oscillator signal, wherein the rectifying and coupling means comprise:
- a phase splitter;
- a plurality of transistors arranged in a network;
- whereby a signal output from the transformer drives the switching means at an even multiple of the local oscillator frequency for down converting the first signal frequency.
6 more elements
Dependencies are inferred from the claim text.