100 MHz monolithic lowpass filter using balanced-type NIC's

In+3xdu&i on The monolithic filter in reference (1) requires no pnp transistors even in bias circuits and its implementation by a standard bipolar process showed good frequency characteristics up to 10 MHz. This fact tempts us to implement higher-frequency filters by a much advanced process. This summary reports a monolithic implementation of a 100 MHz lowpass filter by a 3 micron biplar process. The lowpass filter is realized by a NIC-based gyrator technique like in reference (1 ) . Although the lowpass filter inherits low sensitivity property to reactance elements from a prototype LCR filter, a canpensation for nonidealities of transistors is indispensable especially in such a extremely high-frequency filter. The campensation method is discussed in this summary. A monolithic implementation and experimental results of the filter are shown.