Title :
A 45MHz VCO Combining High Linearity With High Modulation Bandwidth
Author :
Smits, J.W. ; Verhoeven, C.J.M. ; van den Broeke, L.A.D.
Author_Institution :
Delft University of Technology, Department of Electrical Engineering, Mekelweg 4, 2628 CD Delft, the Netherlands, tel. 015-786482
Abstract :
A fully monolithic 45MHz Voltage-Controlled Oscillator (VCO) is described, that achieves high linearity (differential gain below 1%) at frequency sweeps up to 25MHz. This has been accomplished by way of a new compensation method that cancels the effect of Switching Time Delay (STD). Because a forward compensation method is applied, the modulation bandwidth is not affected. The circuit has been integrated in a 3GHz bipolar semi-custom process.
Keywords :
Bandwidth; Capacitors; Chirp modulation; Delay effects; Frequency modulation; Linearity; Phase modulation; Switching circuits; Threshold voltage; Voltage-controlled oscillators;
Conference_Titel :
Solid-State Circuits Conference, 1991. ESSCIRC '91. Proceedings - Seventeenth European
Conference_Location :
Milan, Italy
