GAS MIXERS SPECIALLY ADAPTED

Brand	Owner	Address	Description
APEX	VEECO INSTRUMENTS INC.	1 Terminal Drive Plainview NY 11803	Gas mixers specially adapted for installation in CVD (chemical vapor deposition) and MOCVD (metal organic chemical vapor deposition) process machines for use in thin film manufacture for semiconductor device, LED, electronics, solar cell, microelectromechanical, and optical applications;
	Where the owner name is not linked, that owner no longer owns the brand

Technical Examples

A DCR RF front-end removes the DC term resulting from mixer port to port leakage and feeds RF and LO signals into the mixers with different phase combinations. The signal inputs to the mixers result in the intermediate frequency (IF) output of mixers being 180 degrees out of phase and their DC terms in phase. When subtracting the two outputs from each other the IF signals add up while the DC terms cancel giving a DC free output. A DC offset feedback tuning loop detects the DC offset in the IF domain and then feeds back the tuning voltage to current injection mixers. A multiplier cancels the IF signals and amplifies the DC offset and a comparator compares the amplified DC offset with a threshold voltage and controls the gain of current injection mixers. The feedback tuning loop thus tracks time-varying DC offsets in real-time.