Single side band transmitter having reduced DC offset
First Claim
1. A single side band transmitter comprises:
- current source modulation module operably coupled to modulated, in accordance with a modulation protocol, data to produce an in-phase current component and a quadrature current component;
current mirror module operably coupled to mirror the in-phase current component to produce a mirrored in-phase current component and operably coupled to mirror the quadrature current component to produce a mirrored quadrature current component;
first mixing module operably coupled to mix the mirrored in-phase current component with an in-phase component of a local oscillation to produce a first mixed signal;
second mixing module operably coupled to mix the mirrored quadrature current component with a quadrature component of the local oscillation to produce a second mixed signal;
summing module operably coupled to sum the first and second mixed signals to produce an up-converted signal; and
power amplifier operably coupled to amplify the up-converted signal to produce a radio frequency signal.
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Accused Products
Abstract
A single side band transmitter having reduced DC offset includes a current source modulation module, a current mirror module, a 1st mixing module, a 2nd mixing module, a summing module, and a power amplifier. The current source module is operably coupled to modulate, in accordance with a modulation protocol (e.g., FSK) data to produce an in-phase current component and a quadrature current component. The current mirror module is operably coupled to mirror the in-phase current component to produce a mirrored in-phase current component and is also operably coupled to mirror the quadrature current component to produce a mirrored quadrature current component. The 1st mixing module is operably coupled to mix the mirrored in-phase current component with an in-phase current component of a local oscillation to produce a 1st mixed current signal. The 2nd mixing module is operably coupled to mix the mirrored quadrature current component with a quadrature component of the local oscillation to produce a 2nd mixed current signal. The summing module is operably coupled to sum the 1st and 2nd mixed current signals to produce an up converted signal. The power amplifier amplifies the up converted signal prior to transmission as a radio frequency signal.
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Citations
22 Claims
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1. A single side band transmitter comprises:
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current source modulation module operably coupled to modulated, in accordance with a modulation protocol, data to produce an in-phase current component and a quadrature current component;
current mirror module operably coupled to mirror the in-phase current component to produce a mirrored in-phase current component and operably coupled to mirror the quadrature current component to produce a mirrored quadrature current component;
first mixing module operably coupled to mix the mirrored in-phase current component with an in-phase component of a local oscillation to produce a first mixed signal;
second mixing module operably coupled to mix the mirrored quadrature current component with a quadrature component of the local oscillation to produce a second mixed signal;
summing module operably coupled to sum the first and second mixed signals to produce an up-converted signal; and
power amplifier operably coupled to amplify the up-converted signal to produce a radio frequency signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for reduced DC offset in single side band transmissions, the method comprises:
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modulating, in accordance with a modulation protocol, data to produce an in-phase current component and a quadrature phase current component;
maintaining the in-phase current component and the quadrature phase current component in a current domain when mixing with a local oscillation to produce a first mixed signal and a second mixed signal;
summing the first and second mixed signals to produce a radio frequency signal; and
amplifying the radio frequency signal prior to transmission. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A single side band transmitter comprises:
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means for modulating, in accordance with a modulation protocol, data to produce an in-phase current component and a quadrature phase current component;
means for maintaining the in-phase current component and the quadrature phase current component in a current domain when mixing with a local oscillation to produce a first mixed signal and a second mixed signal;
means for summing the first and second mixed signals to produce a radio frequency signal; and
means for amplifying the radio frequency signal prior to transmission. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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Specification