Converter circuit for satellite broadcasting receivers having mixer isolation
First Claim
1. A converter circuit comprising:
- two first high electron mobility transistor units connected in series to each other;
a first band-pass filter for eliminating signals of a specified band from a signal received from a latter-stage of said two first high electron mobility transistor units;
a first high electron mobility transistor mixer for converting a signal derived from said first band-pass filter which does not include the signals of the specified band into a first intermediate frequency signal as an output thereof;
a first directional filter for supplying oscillator power to said first high electron mobility transistor mixer;
two second high electron mobility transistor units connected in series to each other;
a second band-pass filter for eliminating signals of the specified band from a signal received from a latter-stage of said two second high electron mobility transistor units;
a second high electron mobility transistor mixer for converting a signal derived from said second band-pass filter which does not include the signals of the specified band into a second intermediate frequency signal as an output thereof; and
a second directional filter for supplying oscillator power to said second high electron mobility transistor mixer.
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Accused Products
Abstract
A horizontally polarized wave signal is amplified in low-noise by two first LNAs connected in series to each other. The resulting low-noise amplified signal is entered into a first high electron mobility transistor mixer via a first band-pass filter. The first high electron mobility transistor mixer converts the signal into an intermediate frequency signal based on local power fed from a local oscillator via a Y-type distribution circuit and a first directional filter, and provides the converted signal as an output thereof. Meanwhile, a vertically polarized wave signal is amplified in low-noise by two second LNAs connected in series to each other. The resulting low-noise amplified signal is entered into a second high electron mobility transistor mixer via a second band-pass filter. The second high electron mobility transistor mixer converts the signal into an intermediate frequency signal based on local power fed from the local oscillator via the Y-type distribution circuit and a second directional filter, and provides the converted signal as an output thereof.
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Citations
3 Claims
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1. A converter circuit comprising:
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two first high electron mobility transistor units connected in series to each other; a first band-pass filter for eliminating signals of a specified band from a signal received from a latter-stage of said two first high electron mobility transistor units; a first high electron mobility transistor mixer for converting a signal derived from said first band-pass filter which does not include the signals of the specified band into a first intermediate frequency signal as an output thereof; a first directional filter for supplying oscillator power to said first high electron mobility transistor mixer; two second high electron mobility transistor units connected in series to each other; a second band-pass filter for eliminating signals of the specified band from a signal received from a latter-stage of said two second high electron mobility transistor units; a second high electron mobility transistor mixer for converting a signal derived from said second band-pass filter which does not include the signals of the specified band into a second intermediate frequency signal as an output thereof; and a second directional filter for supplying oscillator power to said second high electron mobility transistor mixer. - View Dependent Claims (2, 3)
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Specification