Gennum Corporation

Semtech Canada Corporation

Hossein Shakiba

Atul Krishna Gupta

Vasilis Papanikolaou

Apu Sivadas

Eric Iozsef

Mansour Shashaani

A folding adaptive equalizer is provided. The equalizer comprises an equalizer core and an automatic gain control loop. The equalizing transfer function of the equalizer core is modulated by one or more gain control signals generated by the automatic gain control loop and by a folding signal generated by the automatic gain control loop. When the folding signal is inactive, an increase in the gain control signals produces an increase in the high-frequency, high-bandwidth gain of the transfer function of the equalizer core. When the folding signal is active, further gain can be applied by decreasing the gain control signals, which produces a frequency-shift in the transfer function of the equalizer core toward lower bandwidth and an increase in the high-frequency, low-bandwidth gain of the transfer function of the equalizer core.

Folding sequential adaptive equalizer

A tunable ring oscillator, in accordance with the teachings described herein, may include one or more delay circuits having a coarse tuning circuitry and a fine tuning circuitry. The coarse tuning circuitry may be used to set one of a minimum time delay or a maximum time delay as a function of a coarse tuning input. The fine tuning circuitry may be used to adjust between the minimum time delay and the maximum time delay as a function of a fine tuning input.

Tunable ring oscillator

An adaptive equalizer with a large data rate range is provided. The equalizer comprises an equalizer core, a slicer and an automatic gain control (AGC) loop. The equalizer core is coupled to an input signal from a transmission medium and applies a transfer function to the input signal to compensate for losses incurred in the transmission medium in order to generate a core output signal. The equalizer core is also coupled to a bandwidth control signal that controls a bandwidth of the transfer function. The slicer is coupled to the core output signal and converts the core output signal to a digital output signal having a fixed digital output swing that approximates a transmission swing of the input signal prior to transmission over the transmission medium. The AGC loop is coupled to the core output signal and the digital output signal and compares the core output signal with the digital output signal in order to generate the bandwidth control signal.

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Richmond Hill, Canada

Hossein Shakiba