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US 6,650,883 B1Granted
Mixer with adjustable linearity
AssigneeInfineon Technologies AG
InventorsCatala Stephane, Ganser Siegfried
Life of this patent
Estimating the term…
Abstract
A four-quadrant multiplier for mixing RF signals comprises two differential amplifiers respectively connected as a load of a third differential amplifier. Both the negative feedback and the load of the third differential amplifier can be altered. Changing the negative feedback permits adjustment of the linearity range of the four-quadrant multiplier.
Claims12
A four-quadrant multiplier for mixing RF signals, comprising:
- first, second and third differential amplifiers, said first and second differential amplifiers being respectively connected as a load of said third differential amplifier;
- a first RF signal being fed to control terminals of said first and second differential amplifiers;
- and
- a second RF signal being fed to control terminals of said third differential amplifier,
- wherein an adjustable negative feedback resistance element is respectively connected between a current source and emitters of transistors of said third differential amplifier, and
- an adjustable load change resistance element connects a collector side of said first differential amplifier to a collector side of said second differential amplifier.
3 more elements
A receiver for modulated RF signals, comprising:
- a four-quadrant multiplier for mixing RF signals, comprising:
- first, second and third differential amplifiers, said first and second differential amplifiers being respectively connected as a load of said third differential amplifier;
- a first RF signal being fed to control terminals of said first and second differential amplifiers;
- and
- a second RF signal being fed to control terminals of said third differential amplifier, wherein an adjustable negative feedback resistance element is respectively between a current source and emitters of transistors of said third differential amplifier;
- and
- an amplifier, wherein
- said first RF signal is one of a reference signal from a local oscillator and an amplified modulated RF signal from said amplifier and said second RF signal is the other of said reference signal from a local oscillator and said amplified modulated RF signal from said amplifier, and
- an adjustable load change resistance element connects a collector side of said first differential amplifier to a collector side of said second differential amplifier.
6 more elements
A four-quadrant multiplier for mixing RF signals, comprising:
- first, second and third differential amplifiers, said first and second differential amplifiers being respectively connected as a load of said third differential amplifier;
- a first RF signal being fed to control terminals of said first and second differential amplifiers;
- and
- a second RF signal being fed to control terminals of said third differential amplifier, wherein an adjustable negative feedback resistance element is respectively connected between a current source and emitters of said third differential amplifier, and wherein a fixed negative feedback resistance element is respectively connected in parallel to said adjustable negative feedback resistance element and is further connected between said current source and said emitters of said transistors of said third differential amplifier.
1 more element
A receiver for modulated RF signals, comprising:
- a four-quadrant multiplier for mixing RF signals, comprising:
- first, second and third differential amplifiers, said first and second differential amplifiers being respectively connected as a load of said third differential amplifier;
- a first RF signal being fed to control terminals of said first and second differential amplifiers;
- and
- a second RF signal being fed to control terminals of said third differential amplifier, wherein an adjustable negative feedback resistance element is respectively between a current source and emitters of transistors of said third differential amplifier;
- and
- an amplifier, wherein
- said first RF signal is one of a reference signal from a local oscillator and an amplified modulated RF signal from said amplifier and said second RF signal is the other of said reference signal from a local oscillator and said amplified modulated RF signal from said amplifier, and
- a fixed negative feedback resistance element is respectively connected in parallel to said adjustable negative feedback resistance element and is further connected between said current source and said emitters of said transistors of said third differential amplifier.
6 more elements
Dependencies are inferred from the claim text.