Active high pass filters pass signals from high frequencies and reject signals from low frequencies. There are two basic types of products: switched capacitor and continuous. Both are available with first to eighth order filtering, and may meet requirements from European Union (EU) directives such as Restriction of Hazardous Substances (RoHS) and End of Life Vehicle (ELV). Switched capacitor active high pass filters are clocked devices. The input signal is sampled at a high rate and processed discretely instead of on a continuous-time basis. By contrast, continuous filters have a continuous time operation. Other types of active high pass filters are also be available.