This paper presents a multi tunable phase sensitive detection low-pass filter for bioimpedance spectroscopy applications. It is based on a four switches demodulator to perform the rectification process and a first order fully differential low-pass filter to extract the desired DC components of target bioimpedance. Its gain is programmable with a 2-bit resolution from 0 to 20 dB and the cut-off frequency can be tuned in a range from few Hz up to few hundreds of kHz. Power consumption is 36.1 μW for a 1.8 V single supply implementation, thus making it suitable to be embedded in an integrated bioimpedance measurement system.