CONG THANH NGUYEN
Cosmetology in Garland, TX

5994967, Nov 30, 1999

Jul 31, 1997

8/904094

Cong Dinh Nguyen - Sachse TX

Dallas Semiconductor Corporation - Dallas TX

H03L 700

331 1R

An integrated, crystalless oscillator includes a voltage controlled oscillator circuit for generating an output signal, and a frequency-locked feedback network to stabilize the frequency of the output signal. The frequency-locked feedback network includes a divide-down circuit and a frequency-controlled variable resistor, the divide-down circuit divides down the frequency of the output signal to produce a feedback frequency which is used to control the frequency-controlled variable resistor. The control voltage for the voltage controlled oscillator circuit is derived from the voltages across a fixed resistor and the frequency-controlled variable resistor. The voltages across these resistors drive an amplifier, with the output of the amplifier being the control voltage for the voltage controlled oscillator circuit.

5963105, Oct 5, 1999

Jul 31, 1997

8/903822

Cong Dinh Nguyen - Sachse TX

Dallas Semiconductor Corporation - Dallas TX

H03B 504

331176

In an integrated crystal-less device that generates an output signal with the frequency of the output signal dependent at least in part on a resistive element, there is provided circuitry for providing compensation for the temperature coefficient the of resistive element, the circuitry includes a bandgap reference and a resistive network. The bandgap reference utilizes components having stable temperature coefficient to generate a first voltage, a reference voltage, and also to generate second voltage, a voltage proportional to absolute temperature. The resistive network includes two trimmable resistors, which are trimmed such that the resistive network in combination with the bandgap reference compensates for the absolute value of the resistive element in a selected temperature range.

5982241, Nov 9, 1999

Jul 31, 1997

8/903820

Cong Dinh Nguyen - Sachse TX
Stephen Christopher Brightman - Dallas TX

Dallas Semiconductor Corporation - Dallas TX

H03L 700

331 49

A monolithic oscillator having dual programmable fixed frequency outputs includes crystal-less oscillator circuitry utilizing frequency-locked feedback to generate ai signal having a select frequency, the frequency being stabilized over temperature and voltage by compensation circuitry associated with the crystal-less oscillator circuitry. A programmable prescaler is coupled to the crystal-less oscillator circuitry for varying the frequency of the signal generated by the crystal-less oscillator circuitry by a select amount. The monolithic oscillator further includes inputs for receiving an external signal, such as an external reference signal, or for connection to a crystal for providing an alternative frequency reference. A multiplexer is used to select either the external signal (or crystal) or the signal from the crystal-less oscillator circuitry to be used for the output signal. Monolithic oscillator further includes a programmable frequency divider coupled to the multiplexer to vary the frequency of the signal from the multiplexer by a select amount to one of the dual outputs.

6107838, Aug 22, 2000

Feb 1, 1995

8/382332

Cong D. Nguyen - Sachse TX

Honeywell International, Inc. - Morristown NJ

H03D 100

327 50

A circuit is provided for transmitting and receiving digital signals at a single circuit point simultaneously without significant interference with the output signal. The circuit monitors current flow at the common pin and converts the current flow to a voltage potential between circuit points as a function of the status of the output and input signals at the pin. In other words, the voltage potential between the preselected circuit points defines the status of the input based on the status of the output. Therefore, regardless of the status of the output from a first device, the status of the input at the common pin can be determined by monitoring the voltage potential between the two circuit points.