Pen system with internal pressure tilt rotation

A pen and touchscreen system for simultaneously measuring touch and pen inputs on a touch sensor, the system comprising:

• drive/receive circuits each adapted to be coupled to a respective single row or column electrode of the touch sensor, each drive/receive circuit operable to drive at least one touch sensor analog signal to its respective electrode on one or more touch sensor frequencies, and further operable to simultaneously sense a pen primary analog electrode signal coupled into the respective electrode at one or more pen frequencies different from the touch sensor frequencies;
• an electronic pen comprising:
• a pivoting nib collet mechanism including a primary electrode element that includes a primary electrode holding a nib and arranged elastically to pivot inside a space formed enclosed by secondary electrodes;
• the secondary electrodes arranged at different locations around a circumference of the primary electrode such that gaps are formed between each secondary electrode of the secondary electrodes and the primary electrode;
• a first drive/receive circuit electrically connected to the primary electrode and configured to drive the pen primary analog electrode signal onto the primary electrode;
• and
• second pen drive/receive circuits respectively connected to the secondary electrodes, a drive/receive circuit of the second drive/receive circuits configured to transmit a secondary analog electrode signal and simultaneously sense the pen primary analog electrode signal coupled across a gap of the gaps via the secondary electrode of the secondary electrodes in which a drive/receive circuit of the second drive/receive circuits further comprises a voltage-following sigma-delta A/D converter combined with a sigma-delta D/A converter having a sigma-delta output filter for driving its respective row or column electrode, the voltage-following sigma-delta A/D converter connected to follow a reference signal on a first reference comparator input by producing a feedback output at a virtual signal node on a second comparator input, the sigma-delta output filter also connected to the virtual signal node;
• further comprising drive signal generation circuitry coupled to the first reference comparator input and operable to generate a mutual analog sensor signal at one or more first frequencies.