Perceptia Devices, Inc.

Kelvyn Enterprises, Inc.

Perceptia IP Pty Ltd

André Grouwstra

Julian Jenkins

Gareth Feighery

Essam Badawi

Tim Robins

Kelvyn Evans

A phase-locked loop (PLL) has an oscillator, a counter and a register to sample the oscillator phase as an integer number. A phase predictor uses a fractional-N frequency control word (FCW) to calculate a predicted phase as an integer number. The integer difference between the sampled phase and the predicted phase is used as loop filter input, to generate an oscillator control signal that adjusts the oscillator frequency. The phase predictor may provide noise shaping, for example via a MASH modulator. A first sleep mode control signal blocks a reference clock and feedback of the oscillator clock to the counter. It may also freeze loop filter parameters and block the output clock. A second sleep mode control signal may stop the oscillator.

Fractional-N PLL with sleep modes

A phase-locked loop (PLL) has an oscillator, a counter and a register to sample the oscillator phase as an integer number. A phase predictor uses a fractional-N frequency control word (FCW) to calculate a predicted phase as an integer number. The integer difference between the sampled phase and the predicted phase is used as loop filter input, to generate an oscillator control code that adjusts the oscillator frequency. The phase predictor may provide noise shaping, for example via a MASH modulator. The PLL may be implemented with dedicated or off-the-shelf circuitry, in an FPGA, or with a programmable processor. A tangible non-transitory memory may hold an associated software instructions for fractional-N phase locking.

Low-power fractional-N PLLs

A phase-locked loop (PLL) has at least two parallel loops. The loops share an oscillator, a counter connected with the oscillator, a multiplexer, and a loop filter. Each loop has a register sampling the oscillator phase from the counter, and a phase predictor which uses a fractional-N frequency control word (FCW) to calculate a predicted phase as an integer number. The loop forwards the integer difference between the sampled phase and the predicted phase to the multiplexer, which selects one of the loops and provides the difference to the loop filter. Loops that are not selected use a monitor-and-adjust function to keep the difference in track with the difference of a selected loop. Loops may provide a loop sleep function and the PLL may also provide an oscillator sleep function.

Multiple-loop fractional-N PLL with hitless switching

A phase-locked loop (PLL) has a primary loop (with a reference clock) and a secondary loop (with a stable reference clock). The secondary loop may include a fractional-N PLL, and may include a secondary loop filter, oscillator, output clock counter, and phase predictor using a rational secondary frequency control word (FCW). The primary loop has a register sampling the oscillator phase from the counter, and a phase predictor which uses a primary fractional-N FCW to calculate a predicted phase as an integer number. The primary loop forwards the integer difference between the sampled phase and the predicted phase to a primary loop filter, which outputs the secondary FCW. The primary loop filter has a much lower bandwidth than the secondary loop filter. The PLL may have multiple primary loops, with a hitless switching function. A primary loop may have sleep mode. The PLL may also provide an oscillator sleep function.

Fractional-N jitter attenuator

Devices, systems, and methods determine the health of oral objects by providing objective measurements using a detachable probe body. The detachable probe body may isolate reusable system components (including an electromagnetic signal detection, signal transmission, energy generation, and or energy transmitting components) from the oral cavity, optionally by encasing at least a portion of one or more of these components in a sheath or the like. A window of the probe body maintains sterile isolation and transmits electromagnetic energy to and/or signals from the oral object. Accuracy can be enhanced by a clamp or other structure for engaging a surface of the oral object so as to maintain a fixed alignment between the signal receiver and the oral object.

Oral health measurement clamping probe, system and method

Devices, systems, and methods determine the health of oral objects by providing objective measurements using a detachable probe body. The detachable probe body may isolate reusable system components (including an electromagnetic signal detection, signal transmission, energy generation, and or energy transmitting components) from the oral cavity, optionally by encasing at least a portion of one or more of these components in a sheath or the like. A window of the probe body maintains sterile isolation and transmits electromagnetic energy to and or signals from the oral object. Accuracy can be enhanced by a clamp or other structure for engaging a surface of the oral object so as to maintain a fixed alignment between the signal receiver and the oral object.

Growing community of inventors

Morgan Hill, CA, United States of America

André Grouwstra