John Ambrose

Vice President of Engineering and System Engineering,
Mixed Signal Integration Corp.


John R. Amrbose is the vice president of applications and system engineering at Mixed Signal Integration Corp. He can be reached at 

Build Your Own RC-Programmable Wide-Bandwidth Bandpass Filter For Comm Applications
Switched-capacitor filters eliminate the need for precision components, but require a clock from a microcontroller to set the center frequency. With the limited number of outputs and timers on popular low-cost microcontrollers, there may not be a clock timer or digital output to dedicate to the filter’s clock function.
Build A High-Frequency Portable Spectrum Analyzer Using Two Filter ICs
By down-converting in the analog domain and splitting the signals into discrete bands, you can build a spectrum analyzer while using a much-slower, less power-hungry microcontroller than a digital-domain design requires.
Circuit Generates High-Frequency Sine/Cosine Waves From Square-Wave Input
Direct digital synthesis ICs can convert square waves to sine/cosine waves but their complexity is a disadvantage. This circuit uses simple CMOS logic and two switched-capacitor filters to perform the conversion.
IC Simplifies Support For FIPS 140-2 Level 4 Digital Encryption

Many solutions exist to supply Federal Information Processing Standard (FIPS) Revision 2, Level 1 and Level 2 digital encryption.1 However, Levels 3 and 4 require monitoring of the environment. Level 3 could be implemented with tamper switches, but they can be bypassed with jumpers or a paper clip. More sophisticated switch sensors require some filtering and deglitching. Level 4 requires monitoring of the supply voltages and temperature. For best results, all of these functions should be as compact as possible.

Add Caliber Determination To Gunshot Detectors
Many communities are installing gunshot detectors on lamp poles to help triangulate the location of gunfire during holidays or to help in responding to "shots fired" 911 calls. Besides location, another piece of useful information is the caliber
Calculate System THD Without Measuring Noise
Designing total-harmonic-distortion (THD) measurement into a system usually involves a notch filter and a broadband ac measurement. The problem with this technique is that it measures both THD and noise. DSP-based test equipment can calcula
Standalone Circuit Converts Square Waves To Sine Waves
Many microcontrollers or PICs will have uncommitted digital-to-analog converter (DAC) outputs that can be used to generate sine waves. But these are generally low resolution (8 to 10 bits), yielding a total harmonic distortion (THD) in the 1% range. O
Understanding the AirPods' Rise
Q&A: What’s New in the Wireless Audio Market? Interview with Jawad Haider, Marvell Semiconductor Read Now
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Fusing Sensors
TDK Swears by Sensor Fusion in $1.3 Billion Deal for InvenSenseBy James Morra New Products Read Now
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