Company Filing History:
4 out of 10 
2 out of 200 
1 out of 122 Years Active: 1984-1996
Title: Innovations of Chieh Chang
Introduction
Chieh Chang is a notable inventor based in Belmont, California, with a remarkable portfolio of eight patents. His contributions to the field of electronics and graphics technology have significantly advanced the capabilities of various devices.
Latest Patents
One of his latest patents is the VGA controller circuitry. This innovation reduces the 'chip set' of a graphics adapter interface card to a monolithic integrated circuit. It includes a programmable analog clock circuit that produces both a video memory clock and a video dot clock. The digital graphics adapter controller responds to these clocks to generate a video information stream. Additionally, a random-access memory utilizes this stream to create a video display information stream, which is then converted to analog signals by a digital-to-analog converter for application to a video display device.
Another significant patent is the switched capacitor single-sideband (SSB) modulator. This integrated modulator consists of six capacitors and employs a differential input operational amplifier. The design allows for the conversion of quadrature-phase input signal voltages into electrical charge flow signals. This innovation enhances the performance of the modulator by making it relatively insensitive to parasitic capacitance effects.
Career Highlights
Chieh Chang has worked with prominent companies such as GTE Lenkurt Incorporated and GTE Communication Systems Corporation. His experience in these organizations has contributed to his expertise in developing advanced electronic systems.
Collaborations
Chieh has collaborated with notable individuals in his field, including Man S Lee and Alex Lushtak. These partnerships have likely fostered innovation and creativity in his projects.
Conclusion
Chieh Chang's contributions to technology through his patents and collaborations highlight his significant role as an inventor. His work continues to influence advancements in electronics and graphics technology.