A communication apparatus that shares precise return channel uplink timing information includes a common symbol timing reference and one or more control stations that each transmit independent asynchronous DVB data streams which evenly share the common symbol timing. Within certain embodiments, the present invention provides a method for treating an inflammatory disorder in a patient with uninterrupted doses of aminopterin. The management apparatus compares an attribute of a first function related to the first volume and an attribute of a second function related to the second volume, and sets the attribute of the second function to be consistent with the attribute of the first function. A body of the first PMOS transistor is tied to a first bias voltage lower than a supply voltage for the buffering and first driving stages.