The present invention provides an analog finite impulse response (FIR) filter, a real-time wideband time delay circuit using the same, and a method thereof. The analog filter comprises: a first time delay cell including n (n1 and n are natural numbers) unit delay cells connected in series, and connected to an input line of the analog FIR filter; a second time delay cell connected to an output line of the analog FIR filter; and a variable gain amplifier which has input/output terminals connected the first and the second time delay cell, and adjusts an intensity and a polarity of an input signal in response to a first and a second signal (a_n, P_n). The variable gain amplifier includes a single-to-differential amplifier and a Gilbert cell.
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