Mixed mode hybrid harmonic load pull system
OwnerChristos Tsironisinventor
Life of this patent
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Abstract
A hybrid multi-harmonic load pull tuner is composed of a main frame and a harmonic extension module. The main frame includes two independently controlled synchronized signal sources, one injecting power into the input of a DUT (transistor) and the other injecting power via a power amplifier into the output of the DUT. The harmonic extension module pre-matches the amplifier to the DUT at a fundamental frequency and creates arbitrary user defined impedances at two harmonic frequencies. The quasi open-loop hybrid configuration ensures conjugate matching of transistors with very low output impedance using low injected power under stable (non-spurious) operation conditions.
Claims6
A hybrid load pull test system comprising:
- a main frame and a harmonic extension module,
- wherein,
- the main frame comprises two remotely controlled synchronized signal sources generating RF signal at a frequency Fo, a first signal source and a second signal source, and at least one power amplifier having an input port connected to the second signal source and an output port;
- and wherein,
- the harmonic extension module comprises a test and an idle port linked using a low loss transmission airline with an axial slot (slabline), a bi-directional signal coupler having an input, an output, a coupled and an isolated port, three remotely controlled carriages, a first carriage placed closest to the test port, a second carriage and a third carriage, all moving along the slabline each holding at least one remotely controlled reflective tuning probe (slug) perpendicularly insertable into the slabline;
- and wherein
- the tuning probe(s) controlled by the first carriage cover a frequency range not lower than 3Fo and have shorter length along the slabline than the tuning probes controlled by the second and third carriages, which cover a frequency range not above 2Fo;
- and wherein
- the test port is connected to a device under test (DUT), the input port of the bi-directional signal coupler is connected to the test port, the output port of the bi-directional signal coupler is connected to the slabline of which the idle port is connected to the output port of the power amplifier;
- and wherein
- the coupled and isolated ports of bi-directional signal coupler are connected to an external harmonic receiver.
Dependencies are inferred from the claim text.