DISCRETE_STEP(dst_rcfilter)
{
	if (EXPECTED(m_is_fast))
		m_v_out += ((DST_RCFILTER__VIN - m_v_out) * m_exponent);
	else
	{
		if (UNEXPECTED(m_has_rc_nodes))
		{
			double rc = DST_RCFILTER__R * DST_RCFILTER__C;
			if (rc != m_rc)
			{
				m_rc = rc;
				m_exponent = RC_CHARGE_EXP(rc);
			}
		}

		/************************************************************************/
		/* Next Value = PREV + (INPUT_VALUE - PREV)*(1-(EXP(-TIMEDELTA/RC)))    */
		/************************************************************************/

		m_vCap += ((DST_RCFILTER__VIN - m_v_out) * m_exponent);
		m_v_out = m_vCap + DST_RCFILTER__VREF;
	}
	set_output(0,  m_v_out);
}