Abstract: Apparatus and methods for signal generation, reception, and calibration involving quadrature modulation and frequency conversion. Embodiments of the present invention provide extremely wide bandwidth, high spectral purity, versatility and adaptability in configuration, and ease of calibration, and are particularly well-adapted for use in integrated circuitry.

Abstract: Apparatus and methods for signal generation, reception, and calibration involving quadrature modulation and frequency conversion. Embodiments of the present invention provide extremely wide bandwidth, high spectral purity, versatility and adaptability in configuration, and ease of calibration, and are particularly well-adapted for use in integrated circuitry.

Abstract: Apparatus and methods for signal generation, reception, and calibration involving quadrature modulation and frequency conversion. Embodiments of the present invention provide extremely wide bandwidth, high spectral purity, versatility and adaptability in configuration, and ease of calibration, and are particularly well-adapted for use in integrated circuitry.

Abstract: Apparatus and methods for signal generation, reception, and calibration involving quadrature modulation and frequency conversion. Embodiments of the present invention provide extremely wide bandwidth, high spectral purity, versatility and adaptability in configuration, and ease of calibration, and are particularly well-adapted for use in integrated circuitry.

Abstract: Apparatus and methods for signal generation, reception, and calibration involving quadrature modulation and frequency conversion. Embodiments of the present invention provide extremely wide bandwidth, high spectral purity, versatility and adaptability in configuration, and ease of calibration, and are particularly well-adapted for use in integrated circuitry.

Abstract: Apparatus and methods for signal generation, reception, and calibration involving quadrature modulation and frequency conversion. Embodiments of the present invention provide extremely wide bandwidth, high spectral purity, versatility and adaptability in configuration, and ease of calibration, and are particularly well-adapted for use in integrated circuitry.

Abstract: Apparatus and methods for signal generation, reception, and calibration involving quadrature modulation and frequency conversion. Embodiments of the present invention provide extremely wide bandwidth, high spectral purity, versatility and adaptability in configuration, and ease of calibration, and are particularly well-adapted for use in integrated circuitry.

Abstract: Apparatus and methods for signal generation, reception, and calibration involving quadrature modulation and frequency conversion. Embodiments of the present invention provide extremely wide bandwidth, high spectral purity, versatility and adaptability in configuration, and ease of calibration, and are particularly well-adapted for use in integrated circuitry.

Abstract: A directional bridge for characterizing a signal reflected from an RF device under test(DUT)) the bridge comprising: a differential signal source with two antipodal outputs wherein the first output is connected to a reference termination, and the second output is connected to the DUT, and at least one equal-ratio resistive divider wherein one side of the resistive divider is attached to the first output, and the second side of the resistive divider is connected to the second output and the middle point of the resistive divider is connected to a receiver, wherein said equal-ratio resistive divider is configured to provide a separated forward and reverse signals by canceling a differential mode of a transmitted signal at said bridge.

Abstract: Apparatus and methods for signal generation, reception, and calibration involving quadrature modulation and frequency conversion. Embodiments of the present invention provide extremely wide bandwidth, high spectral purity, versatility and adaptability in configuration, and ease of calibration, and are particularly well-adapted for use in integrated circuitry.

Abstract: Apparatus and methods for signal generation, reception, and calibration involving quadrature modulation and frequency conversion. Embodiments of the present invention provide extremely wide bandwidth, high spectral purity, versatility and adaptability in configuration, and ease of calibration, and are particularly well-adapted for use in integrated circuitry.

Abstract: A simple and efficient method to measure base-band gain and phase imbalance as well as orthogonality phase imbalance in a quadrature (IQ) modulator (12). The method comprises estimating values of modulator gain and phase imbalances (34) while the modulator is operational, by inputting at least one test signal at a base-band frequency 2 fi and computing the imbalances based on the 2 fi term, the computed imbalances then used in normal transmit operation to generate a pre-distortion transformation on the transmit signal to generate an imbalance compensation. The method can be easily expanded to cope with frequency dependent base-band amplitude and phase imbalance. This feature has an advantage when the transmitted signal is a multi-carrier signal, as the compensation can be adapted for each individual carrier.

Abstract: A method of converting RF to base-band signals, or base-band to RF signals, using a novel receiver and transmitter architecture, implementable on a RFIC. The method uses a two-stage conversion sequence: RF to base-band followed by base-band to intermediate frequency in the receiver, and an opposite sequence in the transmitter. A preferred embodiment of the architecture uses a double balance quadrature demodulator (208) for the RF to base-band down-conversion, and an image reflect quadrature modulator (230) for the base-band to intermediate frequency conversion. The architecture is further enhanced to perform power saving and dual-band reception and transmission.