I found the ECG signal picking up a heavy 50Hz noise. So I googled a simple RC 50Hz high pass filter circuit to try to get rid of the annoying line noise.
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Maxim Tutorial 733 A Filter Primer Oct 06, 2008
http://www.maximintegrated.com/app-notes/index.mvp/id/733
http://pdfserv.maximintegrated.com/en/an/AN733.pdf
Abstract: This comprehensive article covers all aspects of analog filters. It first addresses the basic types: first- and second-order filters, highpass and lowpass filters, notch and all-pass filters, and high-order filters. The tutorial then explains the characteristics of the different implementations, such as Butterworth filters, Chebychev filters, Bessel filters, elliptic filters, state-variable filters, and switched-capacitor filters.
Introduction
Ease of use makes integrated, switched-capacitor filters attractive for many applications. This article helps you prepare for such designs by describing the filter products and explaining the concepts that govern their operation.
Starting with a simple integrator, we first develop an intuitive approach to active filters in general. We then introduce practical realizations such as the state-variable filter and its implementation in switched-capacitor form. Specific integrated filters described here include Maxim's MAX7400 family of higher-order switched-capacitor filters.
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