An implantable passive neural stimulator comprising: one or more electrodes configured to apply one or more electrical pulses to excitable tissue; at least one antenna, wherein the antenna is configured to: receive, from a separate antenna through electrical radiative coupling through an electric field, one or more input signals containing polarity assignment information and electrical energy, the separate antenna being physically separate from the implantable passive neural stimulator and the polarity assignment information designating polarities for the electrodes; and one or more circuits connected to the at least one antenna and configured to: control an electrode interface such that the electrodes have the polarities designated by the polarity assignment information, the electrode interface including a polarity routing switch network, create one or more electrical pulses suitable for stimulation of excitable tissue using the electrical energy contained in the one or more input signals, and supply the one or more electrical pulses to the one or more electrodes through the electrode interface such that the one or more electrodes apply the one or more electrical pulses to the excitable tissue according to the polarities designated by the polarity assignment information, wherein the at least one antenna is configured to transmit, to the separate antenna through electrical radiative coupling, one or more stimulus feedback signals, wherein the one or more circuits are configured to generate a stimulus feedback signal, the stimulus feedback signal indicating parameters associated with the one or more electrical pulses applied to the excitable tissue by the one or more electrodes, the parameters including a current and voltage being delivered to the excitable tissue, wherein the one or more circuits include a current sensor configured to sense an amount of current being delivered to the tissue and a voltage sensor configured to sense a voltage being delivered to the excitable tissue, and wherein the current sensor and the voltage sensor are coupled to a resistor placed in serial connection with a first input of the polarity routing switch network that receives an anodic portion of the electrical pulses. one or more electrodes configured to apply one or more electrical pulses to excitable tissue; at least one antenna, wherein the antenna is configured to: receive, from a separate antenna through electrical radiative coupling through an electric field, one or more input signals containing polarity assignment information and electrical energy, the separate antenna being physically separate from the implantable passive neural stimulator and the polarity assignment information designating polarities for the electrodes; and one or more circuits connected to the at least one antenna and configured to: control an electrode interface such that the electrodes have the polarities designated by the polarity assignment information, the electrode interface including a polarity routing switch network, create one or more electrical pulses suitable for stimulation of excitable tissue using the electrical energy contained in the one or more input signals, and supply the one or more electrical pulses to the one or more electrodes through the electrode interface such that the one or more electrodes apply the one or more electrical pulses to the excitable tissue according to the polarities designated by the polarity assignment information, wherein control an electrode interface such that the electrodes have the polarities designated by the polarity assignment information, the electrode interface including a polarity routing switch network, create one or more electrical pulses suitable for stimulation of excitable tissue using the electrical energy contained in the one or more input signals, and supply the one or more electrical pulses to the one or more electrodes through the electrode interface such that the one or more electrodes apply the one or more electrical pulses to the excitable tissue according to the polarities designated by the polarity assignment information, wherein the at least one antenna is configured to transmit, to the separate antenna through electrical radiative coupling, one or more stimulus feedback signals, wherein the one or more circuits are configured to generate a stimulus feedback signal, the stimulus feedback signal indicating parameters associated with the one or more electrical pulses applied to the excitable tissue by the one or more electrodes, the parameters including a current and voltage being delivered to the excitable tissue, wherein the one or more circuits include a current sensor configured to sense an amount of current being delivered to the tissue and a voltage sensor configured to sense a voltage being delivered to the excitable tissue, and wherein the current sensor and the voltage sensor are coupled to a resistor placed in serial connection with a first input of the polarity routing switch network that receives an anodic portion of the electrical pulses.