Motorola Corporation

Loral Defense Systems

Fredrick W Barrett

Kenneth Ewen

The heat dissipation and mechanical stability of an electronic circuit module package (10) is enhanced by filling the module cavity (20) with a perflourinated hydrocarbon cooling liquid, and by placing a micro-bellows (24, 28) within the module cavity. The temperature compression and expansion characteristics of the perflourinated hydrocarbon liquid are compensated by the action of the micro-bellows. The module package contains semiconductor die (16, 18) that require cooling during operation. The perflourinated hydrocarbon liquid provides the necessary heat transfer to the module package.

Liquid-cooled circuit package with micro-bellows for controlling

An array antenna (12) in which dependent programmable and digitally generated time delays are imposed on signals passing through each antenna element (14) is disclosed. A beam steering computer (32) determines data values corresponding to delays needed at each element to form a desired beam angle. These data values are written into digital element signal processors (DESPs) (40) which are associated with each element in one-to-one correspondence. Each DESP (40) includes a waveform generator (30), which produces digitized samples synchronously with a reference clock signal. A stream of the digitized samples passes through and is delayed in a highly precise delay generator (54) before being converted to analog in a D/A converter (60). The analog signal is modulated (62), amplified (66), and then radiated at the associated element (14). Received signals are amplified (70), demodulated (72), converted to digital in an A/D converter (74), and then passed through the same delay generator (54). They are then re-converted to analog (60), modulated (62) back to RF, and combined (50) with other delayed RF signals. The delay generator (50) includes a register file (106) which receives a digitized waveform. A latch (86) receives delay data. The delay data programs a counter (80, 82) to delay the waveform for a variable, integral number of reference clock cycles. The delay data further programs a delay line (88) to impose a further fractional portion of a reference cycle delay on the waveform.

Growing community of inventors

Glendale, AZ, United States of America

Fredrick W Barrett