Agere Systems Inc.

Other

National Semiconductor Corporation

Lucent Technologies Inc.

Jules Joseph Jelinek

Ramin Shirani

Roy Thomas Myers, Jr

Michael A Brown

Shankar Mukherjee

Frank Albert Bilan

Jay Deng

A shared data and clock recovery circuit including a clock synthesizer for generating sampling signals having different phases, a multiple transition detector for receiving a data stream and sampling signals, and for detecting edges in a data stream in response to the sampling signals, a counter and accumulator for detecting the time occurrences and total number of edges, and for performing weighted average calculation to select one of the phases, a decision circuit for detecting the phase difference between a source clock and a local clock such that if the PPM difference between the source clock and the local clock is at least 200 PPM, then selection of a phase is based upon stored historical information, and if the PPM difference between the source clock and the local clock is less than 200 PPM, then selection of a phase is based on a weighted averaging calculation.

Data recovery for non-uniformly spaced edges

Shared data and clock recovery for packetized data

A voltage-to current (V-to-I) converter circuit for use in combination with a current-controlled oscillator (ICO) to form a voltage-controlled oscillator (VCO), wherein the V-to-I converter circuit provides a current to the ICO while this current ranges itself corresponding to the process, supply voltage, and temperature needs of the ICO, thus allowing a more stabilized ICO and VCO. In one embodiment, the V-to-I circuit allows for independent adjustability to compensate for each quantity of required process, supply voltage, and temperature. In another embodiment, the V-to-I circuit includes compensation circuitry for process and temperature only. There is no need for supply voltage compensation because the supply voltage for the V-to-I converter circuit is provided from a supply that has been linearly regulated and preferably built-in on the chip.

Voltage-to-current converter circuit with independent and adjustable compensation for process, voltage, and temperature

A fully integrated, low cost, amplified electro-acoustic loudspeaker is disclosed in which an amplifier circuit (,), radio-frequency receiver amplifier circuit (,), optical receiver amplifier circuit (,), or network based amplifier circuit (,) is directly mounted on the loudspeaker's magnetic assembly (,), contained within the loudspeaker's moving assembly (,), or a combination thereof. The amplified loudspeaker's magnetic assembly (,) is utilized as an electro-magnetic interference shield and/or a heat dissipating element for the attached electronic circuitry. In selected embodiments of the amplified loudspeaker system, the former (,) containing voice coil (,) is additionally utilized for convection cooling of the amplifier circuit (,) or receiver/amplifier circuit combination (,).

Fully integrated amplified loudspeaker

A current-controlled oscillator (ICO) circuit including an all p-channel transistor based ring oscillator, a first current mirroring stage, and a second current mirroring stage. The all p-channel transistor based ring oscillator, p-channel transistors in the input structure of each amplification stage, and metal lines in the ring and from the ring to the amplification stages over an n-well improve noise immunity and tolerance. The first current mirroring stage utilizes an input current to generate a first voltage controlling a series of differential delay cells connected in a ring topology that forms the ring oscillator. The second mirroring stage utilizes a precision current to generate a second voltage controlling at least one amplification stage, which converts corresponding delay cell output signals to a single-ended logic level signal compatible with external circuitry needs. Each amplification stages utilizes the second control voltage to create a similar or ratioed copy of the precision current flowing in each amplification stage. A second embodiment of the ICO is also included, which operates at a lower frequency, thus higher bandwidth, than that of the first embodiment.

Current-controlled p-channel transistor-based ring oscillator

A novel self-supporting flat display screen based on thermionic emission of indirectly heated cathode structures (23, 30, 31, 32, 34; 230, 32, 34) is provided utilizing micro-filament heaters (21) that can be interconnected in any predetermined manner. The planar micro-filament (21) construction utilizes Dewer and Dewer-like techniques (10, 11, 12, 13, 14, 15) for controlling the thermal energy emitted and lowering the power consumption of a display device. Several control electrode techniques (42, 52, 33, 133, 142) are also incorporated in the invention to reduce the voltage levels required to control the display and simplify the overall electronic control circuitry needed by the display device. These techniques are combined to provide a high intensity, high contrast flat panel display using low voltage off-the-shelf electronic driver circuitry.

Display device based on indirectly heated thermionic cathodes

A voltage controlled oscillator (VCO) provides an output signal with an output frequency that varies only minimally for any given input control voltage despite variations in the manufacturing process, temperature and supply voltage. The VCO also includes a multistage ring oscillator which includes a plurality of series-connected current-starved inverter stages. The VCO utilizes a first current source to provide a substantially constant current independent of process, temperature and supply voltage and a second current source to provide a variable current that varies in response to process, temperature and supply voltage. Both current sources generate a respective current signal independent of the input signal to the VCO. An attenuator, responsive to the VCO's input voltage signal (typically from a phase-locked loop filter) provides a control current signal to the ring oscillator. The attenuator receives a supply current created by subtracting the second current from the first current, and utilizes a differentiation subcircuit that attenuates the supply current in response to changes in an input voltage to produce a current control signal that sets the current level in the ring oscillator's cells. The frequency of oscillation of the ring oscillator is determined by the control current signal. Additionally, the VCO circuit may include a current mirror for receiving the control current signal from the attenuator and mirroring the control current signal to the ring oscillator.

Voltage controlled oscillator with efficient process compensation

A power on reset circuit that incorporates a voltage divider, and current reference generator and a switching circuit. The voltage divider generates an output voltage which is a predefined fraction of the supply voltage. The current reference generator generates a reference current which controls a first current mirror in the switching circuit. The switching circuit, which has a sharply sloped voltage transfer characteristic, includes a first transistor that is gated by the voltage divider output and coupled to the first current mirror at a first circuit node. The first transistor draws current from the first current mirror only when the voltage divider output exceeds a threshold voltage, causing the switching circuit to develop a first reset voltage on the first circuit node. The power on reset circuit may also include an inverter having an input coupled to the first circuit node and producing a second reset voltage on a second circuit node. The inverter comprises a current mirror coupled to the current reference generator and a transistor gated by the first reset voltage and coupled the to current mirror at the second circuit node to draw current from the current mirror only when the first reset voltage exceeds the threshold voltage. Additionally, the power on reset circuit may include various types of filters coupled to the voltage divider output and/or the first circuit node to suppress noise in the voltage supply.

Growing community of inventors

San Francisco, CA, United States of America

Jules Joseph Jelinek