A device includes a dielectric layer, an interlayer metal pad in the dielectric layer, a first capacitor over the interlayer metal pad, and a second capacitor over the dielectric layer. The first capacitor includes a first bottom capacitor electrode over and in contact with the interlayer metal pad, a first top capacitor electrode, and a first inter-electrode dielectric layer between the first bottom capacitor electrode and the first top capacitor electrode. The second capacitor includes a second bottom capacitor electrode over and in contact with the dielectric layer, a second top capacitor electrode, and a second inter-electrode dielectric layer between the second bottom capacitor electrode and the second top capacitor electrode.