Carl W. Moreland
Residential Contractor at Filmore Rd, Greensboro, NC

5861831, Jan 19, 1999

Dec 23, 1996

8/772358

Franklin M. Murden - Greensboro NC
Carl W. Moreland - Greensboro NC
Harvey J. Ray - Salem NC
Michael R. Elliott - Greensboro NC
Marvin J. Young - Greensboro NC

Analog Devices, Inc. - Norwood MA

H03M 162

341139

A clock-to-clock auto-ranging ADC operates directly on an analog signal in the IF band or higher to track its gain range on a clock-to-clock basis and produce a digital signal that maintains high resolution of the analog signal without clipping or loss of signal sensitivity. This is accomplished by sampling an analog signal of sufficiently high frequency that a peak detector can accurately determine the maximum signal level over at least one-half a signal period and then reset the signal gain going into the ADC prior to the beginning of the next sampling period. This insures that the analog signal will always be within the range of the ADC. In accordance with the well known principles of sampling theory, the sampled analog signal is aliased into the frequency region between DC and one half the sampling frequency.

5554943, Sep 10, 1996

Dec 1, 1994

8/347704

Carl W. Moreland - Greensboro NC

Analog Devices, Inc.

H03K 524, H03M 172

327 65

An improved magnitude amplifier (magamp) is provided for a serial-type A/D converter. The magamp includes an improved differential input amplifier circuit to which offset circuitry is connected. These elements may be implemented in a single integrated circuit chip or as separate discrete circuits in hardware. The differential input amplifier circuit includes two pairs of differential input transistors, a comparator, and current switching control transistors. The comparator provides outputs that drive the current switching control transistors. The current switching control transistors are connected below the input transistors and not above the input transistors to reduce the parasitic capacitive loading at the outputs of the differential input amplifier circuit and increase the speed of the magamp. The offset circuitry provides the appropriate signals for aligning the output signals for output to the next stage magamp.

5684419, Nov 4, 1997

Dec 1, 1994

8/347909

Frank Murden - Greensboro NC
Carl W. Moreland - Greensboro NC

Analog Devices, Inc. - Norwood MA

H03M 112, H03M 146

327104

A serial-type A/D converter uses magnitude amplifiers("magamps") and comparators for effecting the conversion of analog signals to Gray scale code signals that are then converted to binary digital signals by a Gray scale code-to-binary portion of the serial-type A/D converter. More specifically, a serial-type A/D converter uses an n-bit converter that has n-1 magamps and n-comparators. The n-1 magamps are cascaded such that the V. sub. OL and V. sub. OH outputs of a stage are the inputs to the next stage. The output of the comparators are input to the Gray scale code-to-binary portion of the serial A/D converter. The latching of the comparators occurs outside of the magamps. This allows for the parallel latching of the n comparators. The speed of the serial-type A/D converter is determined by the bandwidth of the magamps. The serial-type A/D converter includes an offset method that significantly reduces the effects of early voltage, V. sub.

5673047, Sep 30, 1997

Jun 6, 1995

8/465885

Carl W. Moreland - Greensboro NC

Analog Devices, Inc. - Norwood MA

H03M 118

341139

A gain compensating differential reference circuit that is used to match the gain of an input differential amplifier, and track and hold circuit at the input of an analog-to-digital converter. The gain compensating differential reference circuit includes a single-to-differential converter to convert a V. sub. REF signal into a V. sub. REF+ and a V. sub. REF- signals whose difference equals the full-scale range of the differential analog input to the A/D converter, a gain matching differential amplifier to process to the differential output of the single-to-differential converter, and a gain matching track and hold circuit to process the output of the differential amplifier. The output of the gain matching track and hold circuit has the same gain and full-scale range as the analog signals processed by the input circuitry of the A/D converter along the analog path.

5534794, Jul 9, 1996

Dec 1, 1994

8/347710

Carl W. Moreland - Greensboro NC

Analog Devices, Inc. - Norwood MA

H03K 190175

326 63

A logic output stage that may be part of a circuit that provides the circuit user with the ability to select the type of digital electronic format for the digital signals output from the circuit. The logic output stage may include separate sections for processing signals so that they will have one of a plurality of digital electronic formats. Moreover, in cases where two or more digital electronic formats are very close, a single section may be used to process digital signals to have these formats.

5757220, May 26, 1998

Dec 23, 1996

8/772359

Franklin M. Murden - Greensboro NC
Carl W. Moreland - Greensboro NC

Analog Devices, Inc. - Norwood MA

H03G 300

327308

A digitally controlled programmable attenuator maintains tight phase matching between attenuated signals over wide ranges of frequencies and power levels regardless of the selected attenuation level. This is achieved with a multi-tap ladder network that sets a desired tap-to-tap dB step-size, a plurality of unity gain digitally switched voltage-to-voltage buffers that are connected between the respective taps and a common output, and a fixed gain stage that sets the attenuator's overall gain/attenuation. The buffers maintain a high and substantially constant impedance whether turned on or turned off. Phase matching within 0. 2. degree. at frequencies up to 300 MHz for 30 dB of gain variation has been realized. The buffers can be implemented with complementary bipolar or BiCMOS processes.

5539338, Jul 23, 1996

Dec 1, 1994

8/348052

Carl W. Moreland - Greensboro NC

Analog Devices, Inc. - Norwood MA

H03K 519

327 19

A circuit for selecting between two states and using the same pin as an input and an output. On power-up, the pin can be connected to either a grounded resistor (to select the first state) or the power supply (to select the second state). The input signal generates a logic select signal. The logic select signal selects between first and second logic formats. If the first format is selected, the pin is used to output a reference voltage for that format. If the second format is selected, the logic select signal also provides a disable signal, that prevents the reference voltage output from appearing on the pin.