Abstract: A sigma delta modulator (350) can be utilized in the Digital-to-Analog (DAC) portion (144) of a modem (120) to achieve a desired level of gain programming. A set of step coefficients (GP2, GP4) are utilized to determined the step size and thereby the overall gain of the modulator (350). A feedback path is provided and configured to deliver the output of the modulator to a gain control block (355) which provides control and stability across the entire transmission bandwidth. A multilevel digital output (320) is provided which represents levels of signal in the digital domain and reduces the number of discrete components required to achieve a particular amount of gain.

Abstract: A sigma delta modulator (350) can be utilized in the Digital-to-Analog (DAC) portion (144) of a modem (120) to achieve a desired level of gain programming. A set of step coefficients (GP2, GP4) are utilized to determined the step size and thereby the overall gain of the modulator (350). A feedback path is provided and configured to deliver the output of the modulator to a gain control block (355) which provides control and stability across the entire transmission bandwidth. A multilevel digital output (320) is provided which represents levels of signal in the digital domain and reduces the number of discrete components required to achieve a particular amount of gain.

Abstract: A system for signal boosting includes a capacitance boosting component that contains a first and second transistor and a capacitor, wherein a positive terminal of the capacitor is electrically connected to a drain of the second transistor and a negative terminal of the capacitor is electrically connected to a source of the first transistor. The system also includes a third transistor operable to receive a clock signal. A drain of the third transistor is electrically connected to the positive terminal of the capacitor. A fourth transistor is operable to receive an inverse of the clock signal. A drain of the fourth transistor is electrically connected to the positive terminal of the capacitor. The system further includes a boost component electrically connected to the capacitance boosting component wherein an output of the boost component is within a selected boost voltage range.

Abstract: By implementing the sampling process at an AC ground node, rather than at a signal side, and adding a gated transistor (610 and 620) in the signal path, the present invention reduces the interdependency between gain and linearity in a switched capacitor mixer circuit, supplies higher power without sacrificing area and simplifies the implementation of the RF switch. Charge boosting circuitry (630) allows a reduction in the effective size of a series switch (610 and 620) that follows a transconductance element (115).