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US 8,283,927 B2Granted
Amplifier
AssigneeSiemens Aktiengesellschaft
InventorsPeter Cork, Sebastian Martius, Markus Vester
Life of this patent
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Abstract
A two port parametric amplifier has a first port that receives an input signal to be amplified and upconverted and a second port that receives a local oscillator signal. The amplified upconverted input signal is emitted as an output at upper and lower sideband frequencies. The amplifier further has a pair of varactor diodes connected between the first port and the second port. The diodes are connected in parallel from the first port and in series from the second port.
Claims12
A two-port parametric amplifier, comprising:
- a first port supplied with an input signal to be amplified and upconverted;
- a second port that receives a local oscillator signal;
- said second port also forming an output at which the amplified and upconverted input signal is emitted as an output at upper and lower side band frequencies;
- and
- amplifier circuitry comprising two varactor diodes connected between said first port and said second port, said varactor diodes being connected in parallel from said first port and being connected in series from said second port.
2 more elements
A magnetic resonance imaging system comprising:
- a magnetic resonance data acquisition unit comprising a local oscillator and a transceiver array mounted in a bore of said magnetic resonance data acquisition unit, and local coils that detect and emit magnetic resonance signals;
- a wireless array that wirelessly amplifies and upconverts said magnetic resonance signals, said wireless array comprising a plurality of amplifiers;
- and
- each of said amplifiers comprising a first port supplied with one of said magnetic resonance signals as an input signal to be amplified and upconverted, amplifier circuitry, connected to said first port, that produces an amplified and upconverted signal from said input signal, a second port, connected to said amplifier circuitry, that receives a local oscillator signal and at which the amplified and upconverted input signal is emitted as an output at upper and lower side band frequencies, and amplifier circuitry comprising two varactor diodes connected between said first port and said second port, said varactor diodes being connected in parallel from said first port and being connected in series from said second port.
1 more element
Dependencies are inferred from the claim text.